FTIR Analysis - Science method

Hello, I have synthesized a powdery material that is highly sensitive to air and decomposes when exposed to air for a short period of time (a few seconds). Is there any way to prevent or delay sample decomposition for FTIR analysis? If I can't use this method to analyze my sample, what other method do you suggest?

I study on some kind of infrared barrier and I don't know how to calculate normalized reflectance spectra weighted by human body radiation?

For example you can see results of this article but authors did not mention the calculation method:

Hi everyone, i have work using paracetamol sample with electrochemical wastewater treatment under special conditions, then analyze with COD (Chemical Oxygen Demand) removal, UV and FTIR.

Analyze by the COD removal, the COD removal is high which were up to 70%. The UV spectra shows that the UV peak were reducing between control and treated. But, the FTIR spectra shows that the FTIR of control (untreated Paracetamol) in blue curve and that of treated in purple curve were same like there's no difference. Whereas, based on the COD removal and UV spectra there is a difference. Can anybody tell the reason why the FTIR curve like that? Is it okay if the curve of FTIR like that? "If the the absorbance of the uv peak were reduces, then the transmittance of the FTIR also reduces" is that statement true? The FTIR curve were confusing, so I need your help.

Thanks in advance...

Does anyone have some good ref talking about how do the FTIR spectra of EDTA change with the formation of Calcium chelate ? Thanks a lot !

I am using Spectragryph V1.2.15 to visualize FTIR Spectra. But it is showing values in "nm" on x-axis. When i chose the "wavenumber(1/cm)" instead of "nm", it changes the range to 16000-25000. Please suggest where can be the problem?

Hello friends,

I am working on RE doped Ferrite materials.

the results comes out for FTIR that there are so many peaks present below 500cm^-1.

i know the peaks 600-500 cm^-1 represents (M-O) bond. But in my FTIR there are more than 5 peaks are present below 500cm^-1. What may be the reason behind this??

How significant is the FTIR study of mixed metal oxide photocatalysts like WO₃-TiO₂ nanocomposites?

I have dyed jute-cotton blended fiber with onion peel and other tannin-containing mordants. But after FTIR analysis, we could not explain if there was an increase in bond formation due to the use of tannin than the non mordanted.Now is there a better spectroscopic method for better understanding bond formation in dyed sample and are there ways to determine the amount of bond formation in a particular sample?

I recently ran an FTIR analysis to identify two unknown microplastics. The result indicates a matching percentage of over 50% with polyethylene for both particles. However, I wonder if these matching percentages are sufficient to report the type of polymer.

what is the matching percentage generally accepted by journals?

I performed FTIR analysis of 2 samples: unmodified cellulose nanocrystal (CNC) and carboxylated CNC that was oxidized by using the TEMPO/NaOCl/NaBr oxidation system. Both spectra are shown.

When comparing the unmodified CNC vs. carboxylated CNC, the carboxylated lacks the broad OH band around 3380 cm-1 and has new peaks (that are indicated in red). What could be the reason for the absence of the broad OH band?

I know that it's been reported in the literature that a C=O band close to 1740 cm-1 (which is applicable to my carboxylated sample) is typical for isolated carboxyl groups without hydrogen bonds. In addition, the spectra provide evidence of OH's presence in the sample due to the 1610 cm-1 band of OH scissoring bend.

I want to know how to make accurate peak analysis of FTIR results. As an example, I have an absorption band between 700-720 of wave-number, I mean the parabola which makes the peak's shape starts at 700 and ends at 720. Can I consider the results which in the literature report that for example a peak at 700 or 711 relates to the specific functional group? I want to know how much deviation is standard when you want to report that this peak is related to which functional group. What is the standard order of this kind of deviation? I want to know some standards regarding this issue since I found some peaks in my spectrum which have near values to the reported results in literature but they do not have exactly the same reported value. Can someone guide me please? If you can introduce me a quantitative amount for the deviation, I would be thankful.

I want to analyse my protein sample that I have prepared in water (5mg per ml) but in FTIR due to presence the hydroxy and hydroxyl ion peak my protein peak is not visible. What should I do in such case? Is there any other way?

I have synthesized copper oxide nanoparticles by immobilizing onto clay fibers but the in spectral scan UV vis characteristic peak diminishes. but FTIR and XRD showed the characteristic peaks of the metal nanoparticles. Should I rely on UV or FTIR and XRD are better than UV vis for characterization of metal oxide nanoparticles?

Do you think that a home microwave oven can be used to eliminate moisture from a soil sample for FTIR analysis or XPS? If so, how many minutes should be used for a complete elimination?

to identify lithium oxide in lithium intercalated graphite

I have synthesized cerium oxide nanoparticles via hydrolysis method using NaOH. I obtained yellow precipitates at the end of reaction indicating synthesis of cerium oxide nanoparticles. But in UV vis spectral scan showing two small humps around 225 and at 350 nm. The FTIR spectra showed absorbance peak at 664 cm-1. In literature, FTIR peaks of cerium oxide nanoparticles are reported at 476 cm-1 (Ce-O stretching), 556 cm-1 (O-Ce-O) and 668 cm-1 (Ce-O) stretching mode. I also have peaks at 1055 and 1318 cm-1 for nitrate.

Does that indicate reduction wasn't complete?

Or Calcination is necessary for Ce oxide nanoparticles synthesis?

I have attached the UV vis spectrum.

Thanks in advance for your assistance and guidance.

I am doing research on natural fiber composites. For composite analysis the tests are as following

1. XRD

2.SEM

3.FTIR

4.DMA

5.DSC

6.TGDTA

7.UTM

8.UV Visible

Is that possible a sample can be use in more than one test?

Please help me

Some data points are above 100 whereas most of them are between 95-99%. I have two questions.

1) How can transmittance percentage go above 100 ? either 0, between 0-100 or 100. How above 100 ?

2) Why in most cases it is just below 100. Why does the sample absorb that much. does it make sense. The samples here are in powder form in SHIMADZU ATR type. Is it okay ? If not how can I solve this problem ?

By the way the sample is epoxy based nanocomposite which was powdered before FTIR analysis.

Hi everyone, i have work using electrochemical method. I tested before and after treatment my sample using FTIR and the spectra shown in the "FTIR-2" image, with the blue curve is untreated and the purple curve is treated. In the UV spectra (UV-FTIR2 image) shows that the peak in UV absorbance were reducing between control and treated.

My friend have a spectra that show as in the image "FTIR-1", but in that spectra there are differences before and after the treatment (the transmittance increases). I worked the steps the same as her, the concentration of samples we did was not much different, just different sample.

We can see that in the figures "FTIR-1" and "FTIR-2" shows the identification of the O-H and C=O groups. "If the absorbance of the UV peak were reduces, then the transmittance of the FTIR will increase" isn't it? So, what does the spectra "FTIR-2" mean? Why in "FTIR-2" there is no difference in transmittance while the peak in the UV were reduces? Why in "FTIR-2" the transmittance not increase too?

Thanks in advance...

Hello everyone,

Here is my problem, I'm beginning a project where I will create a large database of soil spectra (more than 500 soils). The idea of creating such a database is to be able to describe the agronomic properties of a new soil sample based on this database. To produce this database I have access to an ATR-FTIR only.

Thus my concern is how to deal with the different soil granulometry that I will undoubtedly find between different soils samples.

Indeed because of the ATR technologies, the soil/diamond contact surface will have an impact on the result. Is someone already working on this kind of project, or know about some standardized protocols, or a way to take into account this variability?

Already thanking you about the input you can have about this subject, and I'm looking forward to some interesting discussion about this really interesting topic =).

Here is my CV. Could you please review it and mention my mistakes. Your effort makes my CV impressive. Please review it and suggest me some suggestions.

Please!

Thank you for your precious time and suggestions in advance.

I have the FTIR spectra of some OM samples. I am trying to calculate some peak relationships (1650/2920, 1650/1540 etc.) but I have some doubts. The relationship is the simple ratio between both peaks absorbance? Or something else (integralization)? I couldnt find this information in the most recent articles.

Thank you!

Hi there!

I work with infrared spectroscopy (NIR & FTIR) in the field of food science/food chemistry. I'm looking for collaborators with experience in chemometrics (particularly PLS-R & PLS-DA, but other discriminant methods such as SVM or neural networks would also be great). In particular, I'm after people who would be interested in helping with data analysis & writing up some papers based on data I have collected.

If you are interested & have such experience, please contact me & I would love to discuss with you.

Joel

Transmission-FTIR spectroscopy can be used to analyze analytes in aqueous solutions e.g. Proteins in a formulation. Critical step: In order to correctly analyze the structure of proteins, the buffer solution's spectrum needs to be subtracted from the spectrum of the sample containing proteins. However, due to differences in the amount of water that is present in each sample, the difference spectrum cannot be simply calculated by: Difference Spectrum=Protein Spectrum-Buffer Spectrum.

What is a correct method to calculate the difference spectrum for e.g. algorithm based on least squares? I have looked into many papers and the most frequent answer is that a factor is used in calculating the difference spectrum to ensure that the resulting spectrum has a 0 baseline between 1750-2000 cm-1. But using a factor results in negative peaks in the difference spectrum.

I have some samples of CuO nanoparticles, but I need to know the correct procedure to analyze the sample on the FTIR-ATR instrument. Also, what range should I expect my peaks to be visible in? 4000 cm−1 to 400 cm−1 or is it less than that?

I have read about KBr pelleting for the sample preparation, but can the analysis be done without it or is there any other way?

For the reference of my instrument, I have Perkin Elmer Spectrum Two.

What is the procedure to do the FTIR analysis of seeds?

I am a PhD student and am currently working on metabolite profiles of some marine invertebrates.

While analysing some raw data generated from LC-MS, HRMS, NMR and FTIR, I was told by some researchers that these raw data, once submitted to a journal as supporting files, cannot be used further for any other analysis. For each analysis I need to generate the raw data again, otherwise it will be treated as a case of self-plagiarism.

I can see that my raw data has a potential of producing three distinct publications. I can analyse different parts of my raw data differently to present distinct conclusions.

But generating all the raw data again from these analyses, and that too for each publication, does not look sustainable to me. And clubbing all three publications in one also does not seem to be a good option here.

So I would like to know your views on this matter as a researcher and also as an Editor/Reviewer. Also, please share your similar experiences and solutions to it.

Hello dear friends,

I am trying to add our own optical components in the sample compartment region of our Nicolet 380 FTIR. Also, our sample is small, so we need to shrink the size of the beam spot with an iris to avoid signals from the substrate.

Therefore, we want to use a mid IR sensor card to help me find where and how large the light beam is. However, the IR sensor card does not show any color change when I put it in the light path (of course, when the light source is on). The mid IR sensor card we use can detect light in the wavelength range of 5-20 um, the min detectable power density is 0.2 W/cm2.

Did I miss anything here? And do you have any suggestions how I shall detect the beam spot, its position and size?

Any suggestions will be highly appreciated! Thank you in advance!

Best regards,

Ziwei

It is worldwide discussed that we are eating and consuming microplastics from differents sources like food, water, and many others products that are affecting our health, but how can we:

1) Find comercial products that contains microplastics in order to evaluate if they are in the product itself or not?

Is it something that I should give a blind shot on many products focusing of course on one kind of product (i.e, bottled water)?

and

2) How can I prepare samples from them in order to compare the microplastics composition between differents brands? (i.e, to be evaluated through FTIR analysis, 13C NMR and TGA/DTG)

I would like to know from your expertise about this subject, and if possible recommend papers to be read.

Thank you in advance,

Hi,

I am planning to perform FTIR microscopy of brain tissues. I want to know that how slides can be prepared for this purpose. Can H and E stained slides be used or separate slides should be prepared on similar basis as for histology without staining. Later that slides can be stained with H and E stain after getting the peaks.

Please explain is it how we perform the FTIR microscopy and also that FTIR spectroscopy is better option to go for?

Best

Humna

Hello! I have FTIR data of PVDF films with different treatment. I need to calculate value of beta phase and I have some problems with it. There are wave numbers for different phases: http://pubs.rsc.org/en/content/articlepdf/2017/ra/c7ra01267e

There are peaks of gamma and beta phases at 830 and 840 cm^(-1)In my FTIR data and I want to use other peak to determinate beta. But if in one sample I have good peak of beta 473 cm^(-1), in other sample this peak is very weak but peak at 1275 is very strong. What I need to do?

Thank you

I regularly doing ATR-FTIR analysis from several mineral oil and surfactant, lately i discover a strange and unknown peak appear (1000-1300 cm-1) which is not belong to the material absorbance (i'm pretty sure because I have previous measured spectra from the same sample).

In the attachment, I put Fig 1 as the comparison of previous measurement and the current spectra.

I did a background scan and follow with scanning empty sample, and I can get straight line without any obvious noises. (fig 2)

Is there anyone having the same issue or know what happen with the spectra result?

In the other hand, i found this file (Fig 3) appear in my storage folder which I don't know where its coming from.

Is there any relation between this file and the issue in my FTIR spectra?

Kindly advice, thanks!

nb: I use Perkin Elmer FTIR

Hello everyone,

I have a problem with FTIR analysis.

I synthesize a solution with a polymer, metal particles, a protein, and DI water. Then, I make particles from this above solution.

I take some FTIR spectra with two type of samples (solid and liquid). The solid results are very good as my expectation (significantly different), but the liquid results are not. The FTIR spectra from the solution sample are quite same.

I do not know why two results is so different. Is there anyone have experience about this problem? Please give me your opinion, comment, or advice.

Thanks a lot.

I am planning to use ATR-FTIR to find polymer type of microplastic sample.

it is hard to place sample that is very small (1 mm) in the red spot.

Therefore, I am planning to place the sample while it is in the glass filter paper.

But what should be the background reading for the ATR-FTIR to calibrate the sample?

Should it while nothing is there, or with clean glass filter?

I have had FTIR done on my sample of mesoporous silica nanoparticles coated with chitosan. When I received the data I noticed that all the %transmittance values corresponding to the wavenumber (cm-1) are greater than 100. But how can %tranmittance be greater than 100? Logically the maximum value can be 100 whereas the maximum value in my data is around 125. Can someone kindly explain the reason?

From a Bruker spectrometer I get OPUS files (.0 extensions). The files normally would be fed into the OPUS software and a Macro transforms them into .DPT. The transformed files then get uploaded into a database where the data is stored to be analyzed further. My goal is to automate the upload from the spectrometer to the database. Therefore, I won't be able to use the OPUS software anymore.

The idea was to analyze the macro (.mtb) and recreate the logic, but I can't seem to open the macro file in a useful manner, neither can I find useful information on how to convert the OPUS files into .dpt or .txt.

I would be thankful for any help.

I face a difficulties to identify Paraffinic Mineral oil and PAO base oil, from both of the FTIR spectra shows similar peak and absorbances intensity.

Is there any convenient way to distinguish it?

For date palm leaves, FTIR analysis revealed peaks ranging from 4000 to 2800, one of which is extremely close to 4000. (3982) and transmitted more than 80%. Which of the functional groups represents these peaks?

with a note when plants are exposed to salt stress, some of these peaks disappear.

Thank you to everyone who can help.

Hello, if I perform an FTIR analysis of a polymer mixture in brine? I can still determine whether there is an interaction between polymers? For instance, an ftir analysis for HPAM and Xanthan gum in brine. Can you still determine if a hydrogen bond exists between the polymers in brine? thank you

The figure shows the FTIR analysis for Plastic bag sample after three months of incubation with a fungal strain under special conditions. As demonstrated all T% at wave lengths in orange labels refer to standard FTIR polyolefins specifically LDPE as stated by Wiley Spectra Base (2020) in http://spectrabase.com/spectrum/IWxs9GBuNp. The other minor dips appearing in the carbonyl and double bond region blue labeled, and those in the finger-print region labeled in green were confusing, so please I need your help. FTIR of control (untreated Plastic bag) in red curve and that of treated in blue curve.

hello every one.

how i read the FTIR curves to check if there is any reaction occurs between liquid- liquid two phase extraction if i have polymer-salt system (PEG-K2HPO4-water) and small amount of antibiotics ?

if there is any paper related to this topics please upload it here.

This preprint compares the most advanced automated commercial analysis approaches for vibrational spectroscopy including Bruker Lumos II in combination with Purency Microplastics Finder R2021a (FPA-FTIR), Agilent 8700 LDIR (QCL) in combination with Clarity, and WITec alpha300 R in combination with Particle Scout.

Its really worth reading.

Dear more experienced colleagues,

I do external reflection FTIR measurement of waxes on a polyethylene substrate (ski waxes on UHMWPE ski base). I'm wondering why peaks associated with for example C-F stretching peaks in case of fluorinated wax, or Si-O-Si and Si-C peaks in case of silicone-based wax do not have the derivative-like shape (as clearly seen for C-H peaks in the spectra), which is associated with the surface reflection. The shape has rather transmission/absorbtion-like shape, but is pointing up towards higher reflectance and not down, as would be the case if the IR light would be reflected from the PE substrate (which is not expected due to the similar refractive indexes of the waxes and the PE substrate). What is the physical explanation of such behaviour?

Thank you for any help!

I had synthesized MIL-101(Cr) and performed batch kinetics study with dyes. After the kinetics study, I had dried the samples and performed FTIR studies and got a new peak at 2360 cm^-1. I couldn't find a group which had a peak at this wavenumber. Could you please help me in understanding what does this peak corresponds to?

Hello everyone,

FTIR analysis of proteins is possible in both solution and in dried microbial cells. I am interested in the effect of concentrated salt solutions (> 1M NaCl/KCl) on the stability of proteome and usually work with cell lysates. Since FTIR allows monitoring of secondary structure (and comparison between various conditions), I wonder if it could be used with cell lysates (hence, complex solutions of proteins).

I'm trying to synthesize a Fe-based metal organic framework but I got something that i guess is Fe3O4, with comparison through pxrd, ftir, and being magnetic of course,

has anyone similar experience??

I have coated emulsion through layer bi layer coating technique. after FTIR analysis there is no shift of peak occur in coated and un-coated textile. I want its description or reason behind, there might be no chemical interaction between emulsion and textile , only physical attraction that causes no shift of peak, or what else?

Dear all,

I encountered some peaks (right above 2000 cm-1 as seen in the picture attached) that I can't explain while analysing my multiwalled carbon nanotubes (MWCNTs) using FTIR, Perkins Elmer via the ATR method. I have conducted the readings on 4 separate occasions with similar results. According to some of the papers I've come across, none of them seem to have observed these peaks (I have attached one of the papers as an example). I've tried diluting the MWCNTs to 1% in water but it didn't appear to help either. Would anyone be able to explain how or why these peaks could be there? I would appreciate any words of advice you may have for me as this is fairly new to me.

Kindly find some of the other details as stated. My MWCNTs were purchased from Sigma Aldrich (Cat. no: 698849) with >98% carbon basis with an O.D. × L 6-13 nm × 2.5-20 μm early last year (Jan 2020). The MWCNTs viewed in the picture was used directly as purchased without any treatment (to serve as a control) and directly loaded onto the designated surface. A scanning range of 4000-400 cm-1 was used with a scan number of 16.

Can anyone please share or refer any good video links/notes/ppt/website related to the details of various composition analysis (e.g., XPS, XRF, EDAX etc.) carried out in nano-science & nano-technology? It'll certainly provide knowledge about why and when to use such tools or techniques & for which type of samples (e.g., thin films, powder, liquid etc.).

I have a polypropylene-based polymer in which FTIR analysis showed the presence of peaks attributable to PE. How can I determine if it is a PP/PE blend or a propylene-ethylene copolymer? I can perform TG, DSC, XRD and SEM analysis.

A heterogeneous catalyst was synthesized by depositing phosphine capped Au on support.

A fraction of phosphine ligands were removed but it appears that Au-P remains. We wanted to study Au-Au and Au-P bond and what technique is best for the determination of this?

Please suggest to me the methodology

I was wondering,

Can one use X-ray photoelectron spectroscopy, Raman spectroscopy, infrared spectroscopy etc. techniques to probe Au-Au bond Au-P bond?

Thanking you,

Yours,

The reason I ask is that we have a sample of pure C and I would like to compare.

Hi

An plant extract was separated into individual compounds by hplc and uv-vis spectra can be extracted for each individual peak(I'm using DAD) . Furthermore, each peak (fraction) can be collected and another FT-IR ATR spectra could be provided.

How can I identify some of the compounds in my plant extract using this techniques?

Does solvent influence FT-IR spectra (eg. Methanol and 0.1%formic acid)?

I have some P(VDF-co-TrFE) thin films filled with Barium Titanate nanoparticles. The films were prepared by spin-coating techniques and deposited on ITO substrates. The thickness of the films were around 200-300 nm so it is not possible to detach them. I wonder if I can directly measure them using ATR-FTIR?

I am looking forward to your reply.

Best regards.

I have done synthesis of ferric oxide by precipitation method and I have done a FTIR analysis. a peak appeared in ~525 cm-1 while another peak appeared in ~434cm-1 only. what is the meaning of them?

and, why is the peaks are only in foot print region?

And how much does it increase after IR absorption? What is the change in bond length at a natural frequency of vibration and at a given IR energy, for the C=O bond for example?

I have seen in some articles regarding quantification of spectral data using spectra deconvolution. How can I deconvolute the spectral data using Origin or any specialized program? Can somebody please suggest any relevant reading or tutorial, etc. 

Thanks in advance. 

Dear all,

During FTIR spectroscopy for pure milk sample and 2000 ppm urea adulterated milk sample, what might be the reason for not getting a significant difference in the absorbance peak in the range of 1500- 2000 cm-1 wavenumber?

Please suggest necessary steps to be undertaken and related papers.

From FTIR peaks, we can generally calculate the elastic property and the Debye temperature from the Waldron model of a composition.

What else we can calculate aside these calculations?

I want to write a paper on FTIR to describe the Elastic property or (and) something that pertains to the FTIR . Generally, we see the authors introduce XRD in their papers to describe the structure of the compositions. XRD pattern can easily represent the structure of the composition. However, the FTIR peaks also represent the structure of the composition.

So, can I use FTIR instead of XRD in such case?

Using FTIR (Fourier-transform infrared spectroscopy), we analyze composition of our samples containing microplastics ! This technique could give us separated peaks (different absorptions) or we have to purify samples under microscope in order to avoid overlapping ?

I have conducted an FTIR analysis for my extracted asphaltene but I noticed that the absorbance level in the sample is starting from 40% not 0% which means that every single wavelength was absorbed by the sample for at least 40% , do anyone has any explanation for this ?

Note: the FTIR result is attached

Hi all,

I am working on mid-IR spectroscopy of donor bound excitons in the Si host. I am using an FTIR spectrometer with InSb detector and + KBr or CaF2 beamsplitter. I apply above-bandgap excitation at 671 nm with power levels up to 40 mW. The donors are ion-implanted and consequently drive-in diffused. I need to observe a PL emission at the vicinity of 3 um, while the next highest transition is at 2.2 um, while donor ionization energy is 2.1 um. I observe a broad emission from 2.3-2.4 um to 3.2 um. This emission possesses multiple peaks but overlapping with each other. The emission at 3 um is barely recognized. There is a temperature and power dependency of emission intensity but not much change for the shape. I want to identify the originating factor for this emission. What should I do? How can I isolate and amplify the desired emission>

Dear Colleagues

Melanins are heterogeneous polymeric natural pigments and these pigments are widely distributed in nature from bacteria to humans. Today, although the structure of other organic polymers has been enlightened in detail, the structure of melanin polymers has not been elucidated in detail, and these natural biopolymers still remain a mystery. While melanin pigment polymerizes in acidic solutions, it dissolves in alkaline environments, separating into oligomers and monomers. These organic macromolecules are insoluble in organic solvents such as ethanol and methanol, but dissolved by ultrasonic extraction with DMSO (Dimethyl Sulfoxide). Today, melanins are grouped under different subheadings such as eumelanin, pheomelanin, pyomelanin, allomelanin and neuromelanins. As a researcher, I have focused on the production of this pigments for the last four years and I want to illuminate the structure of these mysterious macromolecular pigments with different techniques. Since this organic polymer can be produced very little and is very expensive, its use in industrial areas is not widespread. I have achieved very successful results in melanin pigment production with my new methods and I have managed to increase the yield hundreds of times.

I wonder can we use cryo-electron microscopy techniques to illuminate the structure of these pigments? I want to benefit from the knowledge and experience of expert researchers in this field. I can send melanin pigment to researchers who are interested in the subject. Thank you for your interest and contribution.

Best regards.

I have conjugated glycol chitosan with bolton hunters reagent, the FTIR spectra of glycol chitosan and glycol chitosan plus bolton hunters reagent look exactly the same. I need xy data to look into detail any slight difference between the two

Analysis by origin software

FTIR analysis

Absorption

I'm characterizing Polymer and Elastomer, Now I need to evaluate the data for the FTIR mapping with software. Is there any open source FTIR data analyzer

Kindly please add link for the FTIR free software

I need a Paper for FTIR analysis.

I'm analysing co-crystal using FTIR. Between the pure drug with no change in wave numbers of samples. Do I still continue to test the other?

Dear All,

I've been synthesizing Ge nanoparticles using OAm as a solvent/capping agent.

Now I'm in the process of assigning the FTIR peaks of my samples.

I've assigned almost every peak in the original solvent, and the same with the NPs.

While comparing them it appears that the features related to N-H disappear, while a new peak forms at 908 cm-1. Please find a screenshot of the comparison in the attachments.

Now the amine can attach at the same time the Ge NPs from the nitrogen side as well as the double bond, assuming the condition are not right for an hydrogermilation reaction, meaning the only possibility is the attachment from the nitrogen side, this new peak should be related to some H-C_n-N-Ge. Sadly, such a system is not really represented in literature or textbooks, my colleagues couldn't help, and running a DFT calculation is quite outside my capacity. So i have no way to clearly identify the origin of this peak. This is getting a bit frustrating, so, I'm trying to ask the scientific community for collective knowledge. Does any of you have experience or the meaning to unveil the nature of that damn peak?

Thanks in advance for your time

Bruno