Nergis Arsu

Yıldız Technical University · Department of Chemistry

Metal‐organic frameworks (MOFs) are porous materials with numerous chemical and structural possibilities. Due to their ease of modification, well‐organized structure, and diverse guest molecule chemistry, MOFs are ideal platforms for uncovering improved functional material design characteristics. Quantitative analysis of glucose is crucial, especia...

Metal–organic framework (MOF) is a class of material that is highly porous and modular. Due to their unique properties, MOFs have found applications in gas storage, gas separation, sensing, and supercapacitors. [Zn2(H2L)2(1,2-Bis(4-pyridyl)ethene)4]n, zinc (Zn)-based MOF was used in this work to achieve mode-locked operation in a thulium/holmium-do...

In this study, we designed a platform based on a laser-driven approach for fast, efficient, and controllable MOF synthesis. The laser irradiation method was performed for the first time to synthesize Zn-based MOFs in record production time (approximately one hour) compared to all known MOF production methods with comparable morphology. In addition...

Buluş özellikle, 2-Merkaptotiyokzanton ile DNA ve BSA üzerinde 1 saniye gibi kısa fotoaydınlatma süresinde, gümüş tuzunun gümüş nanoparçacıklara indirgenmesiyle kendiliğinden düzenlenen gümüş nanokümelerin sahip olduğu özelliklerin incelenmesi ile ilgilidir.

Buluş özellikle, 2-Merkaptotiyokzanton ile DNA ve BSA üzerinde 1 saniye gibi kısa fotoaydınlatma süresinde, gümüş tuzunun gümüş nanoparçacıklara indirgenmesiyle kendiliğinden düzenlenen gümüş nanokümelerin sahip olduğu özelliklerin incelenmesi ile ilgilidir.

The interaction of a multi-component system consisting of benzene-1,4-diyldimethanimine-bridged dimeric zinc-phthalocyanine groups (4OMPCZ) with calf thymus DNA (ct-DNA) was investigated using UV-Vis absorption, fluorescence emission spectroscopy methods, and viscosity measurements. The binding constant, Kb, which is an important parameter to gain...

The present invention relates to examination of characteristics of silver nano-clusters self-arranged by means of reduction of silver salt to silver nanoparticles by means of 2-mercapto-thioxanthone on DNA and BSA in short photo-illumination duration of 1 second.

The present invention relates to examination of characteristics of silver nano-clusters self-arranged by means of reduction of silver salt to silver nanoparticles by means of 2-mercapto-thioxanthone on DNA and BSA in short photo-illumination duration of 1 second.

Here we report an environmentally friendly, fast, efficient and low cost method for in-situ preparation of ZnO nanorods in polymer matrix which is obtained using epoxydiacrylate formulation by UV irradiation. Compared to our previous study, the shape of the ZnO nanoparticles even with the same photoinitiator was found to mainly depend on the polyme...

Photopolymerization of PEGMEA/PEGDA monomer mixture consisting of FeCl3.6H2O metallic salt was performed using a Type I photoinitiator, namely 2-Hydroxy-4′-(2-hydroxyethyl)-2-methyl propane (Irgacure 2959). Herein, we report the easy and one-step in-situ synthesis method of a rare ε-Fe2O3 polymorph in a polymer matrix with different concentrations...

This study aimed for the development of a cost effective and efficient method for L-cysteine detection, without employing expensive instrumentation within a short analysis time. The proposed method has been involved in the photochemical preparation of gold nanoparticles and gold nanoparticles on graphene oxide nanostructures. The gold nanoparticles...

In this study, a new benzoin-based multi-arm star polymer was synthesized by using ATRP, and characterization was achieved by spectrophotometric and chromatographic methods. Obtained multiarm (Benzoin-PS)m-polyDVB star polymer was employed as a polymeric photoinitiator for polymerization of methacrylates and acrylates. Photophysical properties of t...

Herein, we report the successful synthesis of dithioxanthone-disulfide [TX-S-]2 as a new one-component type II photoinitiator. Photophysical properties of [TX-S-]2 in terms of fluorescence and phosphorescence properties were investigated and low fluorescence quantum yield was observed, which indicates an efficient intersystem crossing (ISC) that le...

Bimetallic nanoparticles are widely used in chemical catalysis. Their practical performance can be better exploited through morphological control by adjusting the synthetic strategy. Herein, a photochemical synthesis route was used to achieve the controlled preparation of bimetallic Au/Ag BNps. Size and shape control is achieved depending on the ty...

T-BSA binary complex was formed with non-covalent interactions between fluorometric 2-thioxanthone thioacetic acid and stabilizator bovine serum albumin by fluorescence emission spectroscopy as a sensible and practical method. T-BSA concentration at 1.77 × 10⁻⁴ M was obtained as the most suitable and reliable amount for the formation of T-BSA-Hg(II...

Herein, we report photochemical preparation of functional nano hybrid coating and tuning surface properties with the very small addition of POSS compound to the hydrophobic monomer system. 2-(Carboxymethoxy) thioxanthone and aminopropylisobutyl-POSS were used as the photoinitiating formulation in equimolar amounts for Poly(ethylene glycol) methyl e...

In this study, hybrid nanocomposites were synthesized by photo‐crosslinking of poly (ethylene glycol) methyl ether acrylate/poly (ethylene glycol) diacrylate monomer system using 2‐ (carboxymethoxy) thioxanthone and POSS‐(PEG2000)8. Additionally, AgNO3 was added to this formulation and in situ formation of silver nanoparticles onto hybrid nanocompo...

Thioxanthone-Anthracene (TX-A) was used as a one-component Type II photoinitiator for the photopolymerization of PEGMEA/PEGDA monomer mixture consisting of AgNO3, HAuCI4 and MnCI2 metallic salts. In this study, we have seen that nanoparticles (NPs) are distributed differently in solution and in polymer matrices and that the particle size also chang...

In this study, to see the effect of photoreducing agent on the size, shape and distribution of metallic, Ag and Au nanoparticles were synthesized in the presence of a new one component type II photoinitiator namely 2-thioxanthone thioacetic acid-dioxide. In-situ formation of metallic nanoparticles both in solution and polymer matrix was achieved in...

In this study, a new thioxanthone derivative called 3,3′-disulfanediylbis(1-hydroxy-9H-thioxanthen-9-one) was utilized in situ for the photochemical synthesis of monodisperse gold nanoparticles, and simple characterization was achieved by formation of a typical surface plasmon resonance band of gold nanoparticles at 535 nm accompanied by a nice pin...

2-thioxanthone thioacetic acid (TXSCH2COOH, T), which has a fluorometric character, was used for new fluorometric system upon Fe(II) analysis in biological samples as the main target. T-BSA binary complex was firstly consisted with non-covalent interactions between T and BSA at the equilibrium concentration as 1.77 × 10-4.M. T-BSA binary complex em...

2-(9-Oxo-9H-thioxanthene-2-yloxy)-N-(3-silsesquioxanylpropyl) acetamide was synthesized with 2-(carboxymethoxy)thioxanthone and aminopropylisobutyl POSS as precursors. Absorption characteristics of 2-(9-Oxo-9H-thioxanthene-2-yloxy)-N-(3-silsesquioxanylpropyl) acetamide is similar to the thioxanthone, even its molar absorptivity is much higher than...

In this study, One-Component Type II thioxanthone acetic acid based photoinitiators, as well as the conventional Type II photoinitiator with phenyl acetic acid based co-initiators, have been investigated in terms of their photophysical, kinetic and thermodynamic properties by a series of Density Functional Theory (DFT) calculations. Experimental UV...

Data for: “Photophysical, kinetic and thermodynamic study of one-component Type II thioxanthone acetic acid photoinitiators” in European Polymer Journal, Vol. 136, 2020. Metin, E., Arsu, N., Catak, S., & Aviyente, V. (2020). Photophysical, kinetic and thermodynamic study of one-component Type II thioxanthone acetic acid photoinitiators. European P...

Size, shape and distribution-controlled silver nanoparticles (AgNps) were produced by a rapid and efficient method either in solvent or in polymer matrix by which the silver ion is reduced and a polymer matrix is simultaneously generated in the presence of various photoinitiators by the means of UV light. 2-Mercaptothioxanthone (TX-SH), Thioxanthon...

In this study, a thioxanthone derivative, 2-Thioxanthone Thioacetic Acid (TXSCH2COOH) was used to analyze the type of binding to calf thymus DNA in a physiological buffer (Tris-HCl buffer solution, pH:7.0). Several spectroscopic techniques were employed including UV–Vis absorption and fluorescence emission spectroscopy and viscosity measurements we...

Radical-mediated thiol-ene photopolymerization is a method that has been studied intensively since the beginning of the 21st century due to the nature of the click chemistry which can be carried out in a fast, controllable, easy and mild environment conditions and has no or minimum formation of by-products. In order to improve the properties of the...

Parameters such as the type of photoinitiator and UV exposure time are investigated in order to tailor the growth of ZnO nanostructures into a variety of dimensions and structures. Based on the type of photoinitiator, by means of specific photoreducing radicals, hollow, doughnut and spherical-shaped ZnO nanoparticles are prepared in one step. 2-Mer...

Tiyokzanton (TX), boya, mürekkep, çeşitli kaplamaların kürleştirilmesi alanlarında yüksek etkinliği ile en çok kullanılan ve en iyi bilinen fotobaşlatıcılardandır. Sülfür merkezli radikallerin (RS*) radikalik polimerizasyon reaksiyonlarında etkili fotobaşlatıcılar olduğu bilinmektedir. Bu radikaller, oksijene duyarlılıklarının düşük olması ve ikili...

The reaction of salicylaldehyde‐S‐methylisothiosemicarbazone in the presence of ethylenediamine base and iron (III)chloride generated unforeseen homotopic dinuclear triple‐stranded iron (III)helicate. The synthesized helicate was characterized by elemental analysis, IR, UV–Vis spectroscopy, magnetic moment measurement, and evaluated cytotoxic activ...

The present invention particularly relates to synthesizing photo-initiators having poly-oligo-silsesquioxane (POSS) structure and realizing photo-polymerization by using these photo-initiators and simultaneous and in-situ synthesis of Ag nano-particles in polymer matrix comprising POSS structure and obtaining wrinkled surfaces as a result of self-a...

The present invention relates to a photovulcanization application method together with 2nd type photo-initiator with single component which shows both initiator and thiol-en cross- binding characteristics for latex used in the production of said products, in order to prevent allergic reactions which occur in the users of products, made of natural r...

Thioxanthonation of diphenyl units of diphenyl disulfide was achieved successfully. The photoreduction and photostabilization ability of 2, 2′-disulfanediylbis (9H-thioxanthen-9-one) was used for in-situ preparation of Au nanoparticles either in solution or in poly(ethylene glycol) methyl ether acrylate / poly(ethylene glycol) diacrylate polymer ma...

Photoinitiating systems play a key role in the starting point of a polymerization reaction under exposure to a UV or a visible light. The number of publications discussing photoinitiating systems for polymerization has seen a significant growth in recent years and this book provides an update on their latest research developments. The book covers d...

Thioxanthone–anthracene‐9‐carboxylic acid (TX‐ANCA) namely 14‐oxo‐14H‐naphthol [2,3‐b]thioxanten‐12‐carboxylic acid, is synthesized and characterized as part of our continuing interest for syntheses of polyaromatic initiators. Photoinitiator, TX‐ANCA have good absorption properties in the UV and visible region of the electromagnetic spectrum (ɛ370:...

Thioxanthone and its derivatives are the most remarkable molecules due to their vast variety of application such as radiation curing that is, until using them as a therapeutic drug. Therefore, in this study it was intended to use 2-Thioxanthone acetic acid with and without NaCl in Tris HCl buffer solution (pH:7.0) to represent the interaction with...

Self-assembled silver nanoparticles (Ag NPs) on calf thymus DNA (ct-DNA) chains were synthesized in the presence of 2-mercaptothioxanthone (TX-SH) by use of UV irradiation technique. Thioxanthone itself and its derivatives show interesting photochemical and biological properties. The formation of Ag NPs on the ct-DNA was achieved with and without T...

Dielectric properties and AC conductivity of in-situ formed AuNPs/PEGMEA/PEGDA nanocomposite film was investigated at room temperature. Frequency dependent dielectric constant shows that there are two main relaxation mechanisms for both samples. First of these mechanisms which correspond to dipolar polarization of long polymer chain was observed at...

In this study a rapid method is developed to obtain Au nanoparticles (AuNPs)/polymer composite materials by which HAuCl4 salt is reduced and a polymer matrix is simultaneously generated by the means of UV light. 2-Mercaptothioxanthone (TX-SH), thioxanthone (TX), and TX + thiophenol are used as photoinitiator system for the poly(ethylene glycol) met...

Adsorption of anthracene as polycyclic aromatic hydrocarbon molecule on the pristine multi-walled carbon nanotubes (MWCNTs) and function-alized MWCNTs with polymethyl methacrylate (PMMA) has been investigated in an attempt to explore adsorption mechanisms. The morphology of MWCNTs was observed by a Scanning Electron Microscope. Thermal Gravimetric...

We have developed a novel thioxanthone based photoinitiator possessing an anthracene group and carboxylic acid namely ,thioxanthone-anthracene-9- carboxylic acid. 1H NMR and GC-MS were used for the characterization. Photophysical properties, fluorescence and phosphorescence studies were performed. In addition, photopolymerization reactions of mono...

In this study, a thioxanthone derivative named 2-(9-oxo-9H-thioxanthen-2ylamino) acetic acid (TX-NHCH2COOH) was used to investigate small molecule and DNA binding interactions. Absorption and fluorescence emission spectroscopy were used and melting studies were used to explain the binding mode of TXNHCH2COOH-DNA. Intrinsic binding constant Kb TXNHC...

Thioxanthone–anthracene (TX-A) was previously synthesized and used as an initiator for the polymerization of acrylates and methacrylates in air atmosphere. Photodimerization of TX-A was carried out in benzene under light irradiation of >350 nm, and dimer (diTX-A) formation was followed by UV–vis, fluorescence and phosphorescence spectroscopy. The c...

Photoinitiators for free radical polymerization based on the thioxanthone chromophore that contains benzothiophene were synthesized and characterized. Compared to thioxanthone, these compounds show a bathochromic shifted absorption up to ∼460 nm. High quantum yields for intersystem crossing generate sufficient amounts of triplet states. Initiator r...

Thioxanthonation of fluorenone resulted in a new visible light initiator namely, indeno [1,2-b]thioxanthene-7,13-dione (TX-FN). The detailed photophysical properties of the singlet and the triplet excited states of TX-FN are reported using steady-state absorption, fluorescence, and phosphorescence, as well as laser flash photolysis techniques. Phot...

Aromatic esterificated benzophenone derivatives, benzoic acid 4-benzoyl-phenyl ester (BPBz) and bis-benzoic acid 4-benzoyl-phenyl ester (BisBPBz) were simply synthesized and characterized. The triplet states of the photoinitiators were determined by laser flash photolysis and phosphorescence spectroscopy. The photodecomposition of the initiators wa...

Four novel benzophenone-containing photoinitiators (monomers PI-1 and PI-2 and their polymers PPI-1 and PPI-2) were prepared from alkyl α-hydroxymethacrylates. PI-1 was synthesized from reaction of tert-butyl α-bromomethacrylate and 4-hydroxybenzophenone followed by cleavage of tert-butyl groups using trifluoroacetic acid. PI-2 was synthesized from...

A mechanistic study concerning photoinitiated free radical polymerization using Thioxanthone-Carbazole (TX-Cz) as a one-component Type II photoinitiator was performed. TX-Cz presented visible initiator characteristics with absorptions at 434 and 414 nm where the molar absorption coefficients were 2014 and 1754 L mol(-1) cm(-1), respectively. Fluore...

A novel monomeric photoinitiator, tert-butyl 2-((4-benzoylphenoxy)methyl)acrylate (1), with a side-chain benzophenone (BP) group was synthesized from tert-butyl α-bromo methacrylate (TBBr) and 4-hyroxybenzophenone. It was thermally homo- and copolymerized with a coinitiator, N,N-dimethylaminoethyl methacrylate (DMAEM), using free radical polymeriza...

Anthracene was used to form an inclusion complex with methylated-β-cyclodextrin (Me-β-CD) in water. In aqueous Me-β-CD solution, typical fluorescence emission of anthracene was observed. Benesi–Hildebrand's method was used to obtain the stoichiometry of the anthracene–Me-β-CD complex. The Stern–Volmer quenching constants, K sv, and fluorescence qua...

Acetic acid-based thioxanthone (TXCH2 COOH) was synthesized and characterized and used as a photoinitiator for free radical photopolymerization of methyl methacrylate (MMA) in the absence and presence of a tertiary amine (MDEA) in different solvents. Different absorption properties were observed depending on the solvent. Fluorescence and phosphores...

Thiol-ene click chemistry was used for the preparation of polystyrene grafted multiwall carbon nanotubes (MWCNTs) via the thermal initiation method. The thiol end-functional PSt (PSt-SH) was prepared by the nucleophilic substitution reaction of the bromide end groups of PSt obtained by atom transfer radical polymerization. PSt-SH grafted to the sur...

A photoinitiator for free radical polymerization based on the thioxanthone chromophore containing two acidic acid functions was synthesized and characterized. Photophysical studies such as fluorescence, phosphorescence, and laser flash photolysis in addition to photopolymerization of acrylates were performed to elucidate the radical generation mech...

Photoinitiators that operate in the visible range of the electromagnetic spectrum have widespread applications. Thioxanthone based 9-[2-(methyl-phenyl-amino)-acetyl]-thia-naphthacene-12-one (TX-MPA) was synthesized and the characterization of this initiator was confirmed by spectral analysis methods. TX-MPA has excellent absorption properties in th...

Photopolymerization kinetics and conductivity changes of epoxyacrylate composites for various loading modified PSt-MWCNT weight fractions changing from 0.0025 to 0.2 wt.% were evaluated by performing photo differential scanning calorimetry (photo-DSC) and four point conductivity measurements. 0.2% PSt-MWCNT additive polymeric films had their electr...

Various methods were employed to prepare precipitated calcium carbonate (PCC) particles. Particle size and morphology were dependent on reaction conditions as well as temperature, reagents and stirring, either mechanical or by ultrasound probe sonication. Sonication helped to reduce the size of CaCO3 particles as well as the precipitation time. Son...

A new photoinitiator for free radical photopolymerization, belonging to the thioxanthone derivatives, was synthesized and characterized. It was found that the compound absorbs over the whole UV–vis spectrum with relatively high absorption coefficients. Fluorescence studies reveal that three different singlet excited states are responsible for this...