Shohre Rouhani

• Associate Professor of Analytical Chemistry
• Institute for Color Science and Technology

A naphthalene diimide dye with two side amine arm was prepared. Uv–Vis and fluorescence spectroscopic techniques are used for their photophysical and solvatochromic characteristics in different solvents. The Lippert-Mataga plot for naphthalene diimide demonstrated a negative linear dependence by increasing polarity. Results showed naphthalene diimi...

During past decades, carbon dots (CDs) as a kind of nanoparticles with interesting fluorescence properties have retained their place as one of the best bioimaging agents although their effects on plants have been rarely studied. In this study, we synthesized two kinds of concentration-dependent multicolor CDs with two solvent approaches, phosphate...

A naphthalene diimide dye with two side amine arm was prepared. Uv-Vis and fluorescence spectroscopic techniques studied its photophysical and solvatochromic characteristics in different solvents. Its fluorescence quenching mechanism has been carried out as a fluorescence probe model with graphene oxide as an efficient quencher. The results indicat...

Reducing pollution in various industries such as textile is very important. In this paper, two parallel methods were used to reduce pollution of the process and application of dye. The first approach was the selection of plant-based dyes (Madder with the botanical name of Rubia tinctorum and Reseda with botanical name of Reseda odorata) and the app...

Today, the issue of reducing industrial pollution has received much attention. The textile industry is of high important throughout the world. However, its by‐product wastewater pollutes the environment. The first approach was the selection of plant‐based dyes (madder and reseda) and the application of tannin‐based mordants (pomegranate peel and my...

Background Breast cancer is one of the most challenging cancers among women which is considered one of the most lethal cancers to this date. From the time that cancer has been discovered, finding the best therapeutic method is still an ongoing process. As a novel therapeutic method, nanomedicine has brought a vast number of materials that could ver...

Reducing pollution in various industries such as textile is very important. In this study, the important approach was selected to reduce the pollution of dyeing process’s pollution, namely the selection of plant-based dyes and mordants. The dyes and mordants were extracted from ultrasonic media to obtain maximum efficiency with the least pollution....

Novel naphthalimide derivative with amine functional group was prepared, and its FTIR and 1H and 13C-NMR spectral characteristics were reported. The fluorescence quenching of synthesized dye by nanographene oxide was studied using absorption and fluorescence measurements. From the stern-Volmer analysis, we observed that the quenching was mainly due...

The level of fructose is an important indicator alongside the blood glucose level in detecting diabetes mellitus. The development of boronic acid (BA)-modified electrodes are still of interest to researchers in the sensor-based detection systems for fructose. Hence, a novel electro-optical solid-state probe based on fluorogenic dye for saccharide d...

Investigation of the Effect of rGO/TiO2 on Photovoltaic Performance of DSSCs Devices, Prog. Color, Colorants, Coat., 15 (2022) XX-XXX. Abstract In this paper, four indoline-based organic dyes were introduced and studied as photosensitizers in the photovoltaic devices. The starting material for preparing organic dyes by standard reactions is carbazo...

This paper reports the preparation of an ink-jet printed flexible electrochromic device based on a water-soluble viologen-functionalized dendrimer. Polyamidoamine (PAMAM) dendrimers were modified with different concentrations of 1-1 bis(propylamine)-4,4'-bipyridylium dibromides to obtain solution-processable electrochromic materials (K 1 / 2 and K...

It proved that the most destructive effects of the toxic Al ³⁺ ion on the human nervous system and disease that are involved with this system, such as Alzheimer's. The development of solid-state electrodes is still in its infancy during the sensor-based detection methods for Al ³⁺ . Hence, in this study, a novel flexible ITO/PET-based electrochemic...

To improve the β-phase content of polyvinylidene fluoride (PVDF), diacetylene (DA) monomers were embedded in PVDF nanofibers. The PVDF/DA nanofiber membranes were fabricated using the electrospinning technique and polymerized to form polydiacetylene (PDA) after UV irradiation. In this study, the effect of PDA on the crystalline structure of PVDF na...

Fluorescent molecularly imprinted polymer (FMIP) optosensor was utilized for the selective identification of 2,4-dichlorophenoxacetic acid (2,4-D) due to worldwide pollution caused by using herbicides in agricultural industry. In this regards, two derivatives of polymerizable 1,8-naphthalimide namely, 1,8-naphthalimide containing thiourea (NI) and...

A highly selective and sensitive fluorescent sensor for the determination of fructose is developed. The fluorescent sensor was prepared by incorporating a new naphthalimide dye with a planar structure as a selectophore and graphene oxide (GO) nanoplatelets as a quencher for rapid optical detection of fructose. The designed probe, made with the high...

In the present study, a fluorescent optosensor containing a molecularly imprinted polymer in combination with electrospinning was employed for selective recognition of 2,4-dichlorophenoxyacetic acid (2,4-D). Free radical polymerization was carried out on the surface of polyethersulfone (PES) nanofibers as a substrate using a monomer, initiator, tem...

Over the past decades, according to empirical studies, it has been determined that dopamine metabolism plays a key role in many neuropsychiatric diseases. The development of dual-response electrochemical sensors is still in its infancy during the sensor-based detection methods for dopamine. Hence, a novel electrochemical sensor with dual amplificat...

In this paper, we studied preparation of working films of dye-sensitized solar cells using screen printed method. The organic dye based on phenoltiazine with cyanoacrylic acid as the electron acceptor group was utilized as photosensitizer. Fluorine-doped thin oxide (FTO) coated glass is transparent and electrically conductive which is ideal for use...

In this research, alkaloid compounds were extracted from the roots and stems of Berberis vulgaris using response surface methodology. The experimental design used absorption intensity as the response at three levels and four factors. The results showed that the factors of mesh and solvent percentage had more meaningful effects than those of tempera...

Four dye-sensitized solar cell devices are designed and fabricated based on natural dyes extracted from Celosia Cristata, Saffron, Cynoglossum, and eggplant peel, as photosensitizers. The UV-vis technique has been served to determine maximum absorption of natural extract and pre-dyed photoanode. The Fourier transform infrared (FT-IR) was employed t...

The ability to prepare Polydiacetylenes based materials in the polyvinylidene fluoride matrix polymer is interesting due to the combination of colorimetric and electrical signaling. The new PVDF/PDA composite nanofibers were prepared via the electrospinning method. The self-assembly of diacetylene monomers (PCDAs) occurred during the electrospinnin...

Four novel fluorescent organic dyes DH1, DH2, DH3 and DH4 containing iminodibenzyl were prepared as photosensitizer for dye-sensitized solar cells. The fluorescence dyes and their corresponding intermediates were purified and characterized by analytical methods. The results confirmed the corresponding structure fluorescent dyes and their intermedia...

In this study, the polydiacetylene (PDA) is embedded in electrospun polyvinylidene fluoride (PVDF) nanofibers for the preparation of mat with dual colorimetric and piezoelectric responses. The diacetylene monomers are self-assembled during the electrospinning process. The PDA-embedded PVDF nanofibers in blue phase are obtained via photo-polymerizat...

In this study, the optimized conditions of electrophoretic deposition (application potential, application time and concentration of stable graphene oxide (GO) suspension) for development of ultra-thin graphene film on copper substrate are introduced. The current density and deposition efficiency analysis, Ohm resistance measurement, SEM, FTIR and A...

Graphene oxide is an efficient fluorescence quencher for various organic dyes. Herein the fluorescence quenching of graphene oxide has been carried out on a naphthalimide dye as a fluorescent probe model. The interaction between naphthalimide dye and graphene oxide was studied by UV-Vis and fluorescence spectroscopic techniques. The results indicat...

Nanocomposites with thermo and photo-switchable fluorescent properties were synthesized via mini-emulsion polymerization based on spiropyran and methyl methacrylate monomer. The photophysical behavior of fluorescence nanocomposites was investigated by fluorescence spectrophotometry in different temperature, UV-light and time of exposure. It was fou...

A new merocyanine dye was synthesized, and its acidity constant was determined by spectrophotometric and chemometrics methods. The interactions of the new cyanine dye with bovine serum albumin (BSA) have been studied by fluorescence and UV absorption spectroscopy at pH 7.40. A visual color change from red to blue was observed by addition of BSA to...

Allura red is a widely used food colorant, but there is debate on its potential security risk. In the present study, we found that degradation products of the dye were more potent agents with higher carbonic anhydrase inhibitory action than the parent dye. The mechanism by which the compounds inhibit the enzyme activity has been determined as compe...

Quantification of protein concentration is clinically important and especially in low concentration is of great significance. UV/vis absorbance spectrometry is the routinely used measurement method for protein quantization. However, most of the reported methods tend to overestimation, and more critically, depend highly on the timing, protein variat...

Dye-sensitized solar cells (DSSCs) were prepared using various food dyes. Food dyes are economically superior to organometallic dyes since they are nontoxic and inexpensive. The spectrophotometric evaluation of chosen food dyes in solution and on a TiO2 substrate show that the dyes form J-aggregation on the photoelectrode substrate. Oxidation of po...

Magnetic Fe 3 O 4 nanoparticles modified by polypyrrole (PPy@Fe 3 O 4 MNPs) was synthesized by chemical co-precipitation method and used as an adsorbent for removal of cationic dyes, Reactive Red195, from aqueous solutions. The resulting products are characterized by scanning electron microscope (SEM) and FT-IR. The effects of solution pH value, ad...

In this paper, the synthesis of a selective fluorescence “turn-on” nanosensor for methamphetamine (MA) based on a new 1,8-naphthalimide-thiophene derivative (NTS) and its immobilization on the surface of the nano-silica particles (NTS@SiO2) is described. The sensory ability of NTS and NTS@SiO2 toward MA is studied in solution and solid state. NTS d...

A molecular imprinting-based fluorescent optosensor (FMIPs) was developed based on N-allyl-4-ethylenediamine-1,8-naphthalimide as a fluorescent functional monomer in order to study the selective recognition of caffeine as a model drug. The photo physical characteristics of dye and its imprinting polymer in solution and solid form were investigated...

Nanocomposite of poly (methacrylate) and spirobenzopyran-based fluorescent dye was synthesized via miniemulsion polymerization. In this study, hexadecane was used as a co-stabilizer. Considering the effect of dye concentration of nanocomposites, the kinetic behavior of synthesis of fluorescent nanocomposites and the rate of reactions (R p) were inv...

This study describes the ultrasound-assisted synthesis of 4-nitro-N-substituted-1,8-naphthalimide derivatives from 4-nitro-1,8-naphthalic anhydride and related amines by irradiating at 35 KHz in a sonic bath in aqueous media at room temperature. The results obtained by this method are comparable to those obtained by a common reflux method. The imid...

The interaction of a food colourant, quinoline yellow (Qy), and bovine serum albumin (BSA) was investigated by spectrophotometry, spectrofluorometry, FT-IR and circular dichroism (CD) techniques. The experimental results indicated that the quenching mechanism of BSA by the dye was a static procedure. Various binding parameters were evaluated. The n...

The electrochemical oxidation of some catechols has been studied in the presence of N-phenylacetoacetamide in aqueous sodium phosphate buffer (pH=7), using cyclic voltammetry and controlled-potential coulometry. All the catechol derivatives were converted into benzofuran derivatives through a Michael-type addition reaction of N-phenylacetoacetamide...

A novel N-allyl-4-amino-substituted 1,8-naphthalimide dye, containing thiourea functional group with intense yellow-green fluorescence was successfully synthesized. Copolymerization was done with styrene. The photophysical characteristics of dye and its copolymer in solution and solid film were investigated in the presence of halide ions. The resul...

A series of novel monoazo dyes based on N-pyridine-1,8-naphthalimides were prepared using 4-amino-N-2-aminomethylpyridine-1,8-naphthalimide as the diazo component and N,N-diethyl-meta-toluidine, 3-(N,N-diethylamino)acetanilide and N-hydroxyethyl-N-ethylaniline as the coupling components. The synthesised dyes were purified by utilising column and pr...

A series of novel naphthalimide dyes with amino and acetylamino functional groups were synthesized through imidation, reduction and acetylation reactions on 4-nitro-1,8-naphthalic anhydride. The synthesized dyes were characterized by DSC, TLC (Rf values), FTIR, 1HNMR, 13CNMR, UV–visible and Fluorometery. Molar extinction coefficients and wavelength...

A rapid, environmental friendly and low-cost method to prepare hydroxyapatite nanoparticles is proposed. In this method, hydroxyapatite is produced in a sonicated pseudo-body solution. The sonication time was found effective in the formation of the crystalline phase of nanoparticles. In our experimental condition, 15 min sonication resulted in the...

Novel coated graphite electrode (CGE) for the determination of quinoline yellow (QY), an artificial food colorant, was evaluated based on the use of tetraphenylphosponium-QY ion-pair complex as the electroactive substance. The electrode revealed linear emf-pQY response over wide concentration ranges (1.0 × 10−1 ∼ 5.0 × 10−5 M) with a slope −30.1 ±...

TiO(2) and transition metal (Cr, Mn, Fe, Co, Ni, Cu, and Zn) doped TiO(2) nanoparticles were synthesized by the sol-gel method using 2-hydroxylethylammonium formate as an ionic liquid. All the prepared samples were calcined at 500 degrees C and characterized by X-ray diffraction (XRD), BET surface area determination, energy dispersive X-ray (EDX) a...

The UV-visible electronic spectra of some azo dyes have been studied. The different bands observed in the electronic spectra of the compounds in various organic solvents have been assigned to the proper electronic transitions. The solvatochromic behaviour of these compounds was investigated by studying their visible spectra in several pure and mixe...

In this research the novel potentiometric sensors have been evaluated for theselective determination of Cochineal Red A (CRA) in colored food. PVC membrane (PME) and coated graphite electrode (CGE) have been prepared based on tetraphenylphosponium-CRA ion pair as the electro active substance. The electrodes reveal linear emf-pCRA responses over wid...

In this research, the construction and general performance characteristics of a sunset yellow sensor based on sunset yellow-cetyl pyridinum (SY-CPY) ion pair as an ion exchanger were described. A coated platinum wire electrode (CPE) was prepared and compared with coated graphite (CGE) and membrane electrode (PME). The CPE exhibited a rapid and Nern...

In order to fabricate efficient pH optical sensors, the characteristic features of the UV–vis spectra of six synthesized hydroxyazobenzene dyes were studied at different pH(s). Two optical pH sensors were developed using 4-[(p-nitrophenyl)azo]phenol and 2-methoxy-4-[(4-nitrophenyl)azo]phenol dyes immobilized on transparent triacetylcellulose (TAC)...

A series of novel monoazo disperse dyes based on N-ester-1,8-naphthalimides were synthesized using 4-amino-N-methylglycinate-1,8-naphthalimide and 4-amino-N-ethylglycinate-1,8-naphthalimide, as diazo components, with various couplers. The spectrophotometric properties of the dyes were examined in different solvents and their solvatochromism effects...

A multiwavelength spectrophotometric titration method was applied to study the acidity constants of some azo dyes in water. The UV-vis absorption spectra of azo dye solutions were recorded in the course of their pH-metric titration with a standard base solution. The protolytic equilibrium constants, spectral profiles, concentration diagrams and als...

The solubilities of three novel disperse azo dyes, ethyl 2-[6-{(E)-2-[4-(diethylamino)-2-methylphenyl]-1-diazenyl}-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl] acetate (Dye 1), ethyl 2-[6-{(E)-2-3-hydroxy-2-naphthyl-1-diazenyl}-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl] acetate (Dye 2), and 6-{(E)-2-[4-(diethylamino)phenyl]-1-diazenyl}-2-propyl-1H-...

The feasibility of electrosynthesis of dixanthylene photochromic dye by electrochemical reduction of xanthone in the presence of perchloric acid has been investigated in acetonitrile at glassy carbon electrode. The electrode shows a remarkable electrocatalytic effect for the reduction of xanthone. Reduction of xanthone at such an electrode occurs a...

Five novel monoazo disperse dyestuffs based on N‐ester‐1,8‐naphthalimide were synthesized. Acenaphthene was nitrated, then oxidized to 4‐nitro‐1,8‐naphthalic anhydride. 4‐Nitro‐1,8‐naphthalic anhydride was reacted with methyl and ethyl glycinate in alcoholic media, followed with reduction. 4‐Amino‐N‐methyl and ethyl glycinate‐1,8‐naphthalimide were...

Gravitational Field Flow Fractionation (G-FFF) is widely used for characterization of different particles. However, all of the equations for calculation of particle size are suitable for the regular or near spherical shape particles and characterization of irregular shape ones is difficult. For these particles, a well-known equivalent diameter i.e....

A silver-selective optode membrane incorporating hexathia-18-crown-6 for cation recognition and a lipophilic chromoionophore 1,2-benzo-3-octadecanoylimino-7-diethylaminophenoxazine for transduction has been prepared. The PVC membrane composition was optimized to result in the largest working concentration range. The response range of the proposed o...

Novel polymeric membrane (PME) and coated graphite (CGE) silver-selective electrodes based on a calix[4]resorcareneoctamethyl ester has been prepared. The electrodes revealed Nemstian behaviour over a wide Ag + ion concentration range (1.0 × 10 -5-1.0 × 10 -1 mol L -1 for PME and 1.0 × 10 -7-1.0 × 10 -1 mol L -1 for CGE) with very low detection lim...

A cobalt(II)-selective graphite coated PVC-membrane electrode has been developed by using a new dibenzopyridino-substituted macrocyclic diamide as a neutral carrier. The electrode exhibits a Nernstian response for Co2+ ions over a very wide concentration range (7.0×10−7−1.0×10−2 M). The limit of detection was 2.0×10−7 M (ca. 12 ppb). It has a fast...

An ion selective electrode for thiocyanate based on Cu(II)-1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane complex as an ionophore is described. At pH 4.5–10.5, the electrode based on this ionophore and cationic sites (40 percent of the ionophore) responds to thiocyanate in linear (E vs log [SCN]) range from 1.0 × 10 to 7.0 × 10 M. Selectivity c...

A highly selective and sensitive PVC-membrane electrode for Cu(II) ion was developed by using a new thiophene-derivative Schiff's base. The electrode exhibits a Nernstian slope of 29.3±0.7 mV per decade at 25 °C over a very wide concentration range (1.0×10−1–6.0×10−8 M) with a detection limit of 2.0×10−8 M (1.28 ng/mL). The ion selectivity of this...

A PVC-membrane electrode based on a recently synthesized 18-membered macrocyclic diamide is presented. The electrode reveals a Nernstian potentiometric response for Co2+ over a wide concentration range (2.0 x 10(-6)-1.0 x 10(-2) M). The electrode has a response time of about 10 s and can be used for at least 2 months without any divergence. The pro...

A PVC membrane electrode based on bis-2-thiophenal propanediamine (TPDA) coated directly on graphite is described. The electrode exhibits a Nernstian response for Cu2+ over a very wide concentration range (1.0×10−1 to 6.0×10−8 M) with a detection limit of 3.0×10−8 M (2.56 ng ml−1). It has a fast response time and can be used for at least 2 months w...

A novel bromide ion-selective PVC membrane sensor based on 14-phenyldibenzo[a,j]xanthenium bromide as a membrane carrier was prepared. The electrode has a linear dynamic range between 1.0×10−1 and 3.2×10−5 M with a near-Nernstian slope of 61±1 mV per decade and a detection limit of 2.0×10−5 M. The potentiometric response is independent of the pH of...

Eight different recently synthesized macrocyclic diamides were studied to characterize their abilities as strontium ion carriers in PVC membrane electrodes. The electrode based on 1,13-diaza-2,3;11,12-dibenzo-4,7,10-trioxacyclopentadecane-14,15-dione exhibits a Nernstian response for Sr(2+) ions over a wide concentration range (1.0 × 10(-)(1)-3.2 ×...

A new PVC membrane electrode for zinc ions based on a recently synthesized benzo-substituted macrocyclic diamide (1,13-diaza-2,3;11,12;15,18-tribenzo-4,7,10-trioxacyclononaoctane-14,19-dione) as membrane carrier was prepared. The sensor exhibits a Nernstian response for Zn2+ over a wide concentration range (1.0×10−1–9.0×10−5 M). It has a response t...

A recently synthesized 23-member macrocyclic diamide was used as a membrane-active component to prepare a new Cu(2+)-selective polymeric membrane electrode. The electrode exhibits a Nernstian response for copper(II) ions over a wide concentration range (1.0 X 10(-1) to 3.2 X 10(-5) M), with a limit of detection of 1.2 X 10(-5) M (0.77 ppm). It has...

A spectrophotometric method was used to determine the acidity constants of some synthetic derivatives of 1-hydroxy-9,10-anthraquinone in binary methanol-water mixtures at 25°C. A linear inverse relationship is observed between pKa of all acids and the mole fraction of methanol in the solvent mixtures. The influence of the nature and position of sub...

he development of an optical pH sensor based on immobilization of quinizarin (1,4-dihydroxyanthraquinone) on a triacetylcellulose membrane was described. The resulting membrane exhibited fast color change from yellow to violet, while changing the pH in alkaline region. The immobilized quinizarin showed a broader dynamic range from (pH 9.4-11.4) wit...