Ali Reza Modarresi-Alam - Academia.edu (original) (raw)
Papers by Ali Reza Modarresi-Alam
Chemistry Africa, Mar 20, 2024
Express Polymer Letters, 2022
The derivatives of polyaniline have obtained remarkable attention due to their electronic applica... more The derivatives of polyaniline have obtained remarkable attention due to their electronic applications in the field of nanomaterials. This work considers the electronic, structural, and photovoltaic properties of nanocomposites (POT/ WO 3 NPs) synthesized with three different ratios of poly(o-toluidine) and WO 3 nanoparticles [a-c (mol WO 3 /mol monomer) 100 = 60, 65, 70%] using a template-free method and a basic mechanochemical reaction in solid-state. The nanocomposites are analyzed and characterized by various spectroscopy methods. The prepared nanocomposites have core-shell morphology. The results of the band gap assessed via cyclic voltammetry and UV-vis specified that the forbidden band gap for (POT/WO 3 NPs) nanocomposite b [(mol WO 3 /mol monomer) 100 = 65%] are about 1.03 and 1.5-1.9 eV, respectively. The J-V analysis and power conversion efficiency of the fabricated devices FTO|TiO 2 NPs|POT|Al and FTO|TiO 2 NPs|POT/ WO 3 NPs (a-c) |Al single-layer solar cells are performed and discussed. The photovoltaic energy conversion efficiency (PCE) of the two devices are 0.18% and in average, 0.57%, respectively. The data show both indirect and direct transitions are observed for the WO 3 NPs, POT, and POT/WO 3 NP (b). This investigation demonstrates that the morphology and architecture of nanocomposites (POT/WO 3 NPs) can be helpful in improving solar cell performance.
Tetrahedron, Sep 1, 2007
The synthesis of primary carbamates from structurally diverse compounds containing a hydroxyl gro... more The synthesis of primary carbamates from structurally diverse compounds containing a hydroxyl group has been performed in high yields and purity, and without any epimerization under solvent-free conditions using HClO4–SiO2 as a mild, convenient, and effective reagent. The procedure is operationally simple, efficient, and environmentally benign.
Express Polymer Letters, 2021
In the present work, polyaniline-titanium (IV) oxide (PANI-TiO 2) nanocomposites have been synthe... more In the present work, polyaniline-titanium (IV) oxide (PANI-TiO 2) nanocomposites have been synthesized by solidstate (solvent-free) oxidative polymerization method of aniline as a monomer under green condition using both iron (III) chloride hexahydrate (FeCl 3 •6H 2 O) and ammonium peroxydisulfate (APS) as two different type of the oxidants as well as various modes and increasing of the ratios of monomer to oxidant. The structural and morphological of the nanocomposites have been characterized using kinetic and microscopic analysis. The electrical conductivities, cyclic voltammetry, bandgap energy (E g), and morphology of the nanocomposites are mainly dependent on the type of oxidants and reaction conditions. Also, the nanocomposites were shown electro-active and functional properties. The I-V characteristics of PANI-TiO 2 in an Al/(PANI-TiO 2)/TiO 2 /FTO solar cell are achieved by drawing the plot of the I-V curves. It is noted that nanocomposites with different conditions were shown similar FT-IR and UV-Vis spectra with different morphologies. The TEM images in different conditions showed a thin layer of TiO 2 nanoparticles in the outer wall of the nanotube when the APS was used as the oxidant, while when the FeCl 3 was used as the oxidant, the TiO 2 nanoparticles have been distributed on a plantain leaf of PANI matrix. The XRD results confirm completely results obtained from TEM. As a result, the nanocomposites with both methods showed a good P-N junction between TiO 2 and PANI.
ChemInform, Jun 7, 2010
A Facile and Efficient Method for the One-Pot Synthesis of Per-O-Acetylated Thioglycosides from U... more A Facile and Efficient Method for the One-Pot Synthesis of Per-O-Acetylated Thioglycosides from Unprotected Sugars.-Acetylation of various unprotected sugars, including 2-deoxy-2-amino sugars, sialic acid, lactose, and maltose, with a stoichiometric amount of acetic anhydride followed by thioglycosidation with thiocresol furnishes the corresponding thioglycosides in good to high yield under solvent-free conditions.-(
Journal of Power Sources, Sep 1, 2022
Turkish Journal of Chemistry, 2009
A simple and efficient method for the preparation of 5-arylamino-1 H (2 H)-tetrazoles (3a-i) and ... more A simple and efficient method for the preparation of 5-arylamino-1 H (2 H)-tetrazoles (3a-i) and 5-amino-1-ary-1 H− tetrazoles (4a-i), with excellent yields and high purity, from secondary arylcyanamides (1a-i) at room temperature in glacial acetic acid is described. Tautomers 3a-i were separated from tautomers 4a-i by crystallization in ethanol. A mechanism was introduced in glacial acetic acid. The ratio of isomers is described based on the electronic and steric effects of various substituents. The electron withdrawing group (-NO 2) increased the ratio of 4:3. The rate of product formation was enhanced by introducing electron donating substituents. 1 H-NMR and 13 C-NMR chemical shifts and multiplicities are also discussed.
Journal of The Iranian Chemical Society, Mar 1, 2006
The conformational, configurational behavior and the structure of N-2-(1,4-dioxane)-N'-(4-methylb... more The conformational, configurational behavior and the structure of N-2-(1,4-dioxane)-N'-(4-methylbenzenesulfonyl)-O-(4methylphenoxy) isourea 1 has been studied using ab initio and semiempirical calculations (AM1 and PM3). The endo-anomeric effect and hydrogen bonds control the population of dioxane ring conformers or anomers but not the configuration interconversion of the imine of imidoyl moiety. Ab initio and AM1 and PM3 calculations demonstrate that the dioxane ring adopts a chair conformation, that the imidoyl amino group prefers an axial conformation and that the tosyl and tolyl groups about the C=N bond retain an E configuration. The computational analysis of 1 complements the X-ray findings.
Journal of Basic & Applied Sciences, 2021
The objective of this research is the synthesis and characterization of the novel composite of p... more The objective of this research is the synthesis and characterization of the novel composite of poly(o-methoxyaniline)/silica-supported sulfuric acid (POMA-SSSA). The synthesis is done by doping of poly (o-methoxyaniline) emeraldine base in the presence of silica-supported sulfuric acid (SiO2-H2SO4, SSSA) under solid-state (solvent-free) conditions. Herein, poly(o-methoxyaniline) emeraldine salt (POMA-SA) is prepared simply by mixing the base form with H2SO4 in solid-state. The doping process is verified by ultraviolet-visible, Fourier transform infrared spectroscopy and elemental analysis. It is shown that the polymers and composites have maximum doping and the doping counter ion in POMA-SA and POMA-SSSA-bw (before work-up) is HSO4– and in the POMA-SSSA-aw (after work-up) is SO42-. The prepared composites show good conductivity. Scanning electron microscopy (SEM) images show that POMA molecules thoroughly have coated the surface of silica. Moreover, the morphology studies of compos...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Composite Fenton nanocatalyst was prepared by water-based in situ creation of Fe3O4 nanoparticles... more Composite Fenton nanocatalyst was prepared by water-based in situ creation of Fe3O4 nanoparticles integrated within self-assembly 3D reduced graphene oxide (rGO) aerogel. It was used for degradation of Acid Green 25 (AG-25) organic dye in aqueous solution, in presence of H2O2. By investigating the conditions that maximize the dye adsorption by the 3D composite, it was found that the pH of the solution should be adjusted between the pKa of the functional groups presented on the rGO surface (carboxylic acid) and that of the dye (sulfonic acid) to promote electrostatic interactions dye − 3D structure. Performed under these conditions, Fenton degradation of AG-25 in presence of H2O2 was completed in less than 30 min, including all the intermediate products, as demonstrated by MALDI-TOF-MS analysis of the aqueous solution after discoloration. Moreover, this was achieved in a solution with as high dye concentration as 0.5 mg/mL, with only 10 mg of 3D composite catalyst, at room temperatur...
Polymer Bulletin, 2021
In this article, novel nanocomposites of poly( 3 - or m -aminobenzenesulfonic acid) and TiO 2 wer... more In this article, novel nanocomposites of poly( 3 - or m -aminobenzenesulfonic acid) and TiO 2 were synthesized by very simple in-situ polymerization of monomer ( m -ABS) by FeCl 3 .6H 2 O as an oxidant and TiO 2 particles as inorganic phase under solid-state condition. The combination of N-type TiO 2 and P-type PABS led to the preparation of two new P–N junction type nanocomposites. The polymer-hybrid solar cells were fabricated using the nanocomposites as FTO/TiO 2 / NCPABS- TiO 2 /Al and under simulated solar irradiation demonstrated power conversion efficiencies ( PCE , η ) about 1%. The other advantages of this work were fewer fabrication costs, ease-of-processing, green synthesis condition, a simple structure of the solar cell (single layer), and the high stability of the resulted cells. The synthesized nanocomposites ( NCPABS-TiO 2 -1 and 2 ) were characterized by FT-IR, UV–vis, VSM, XRD, CV, TGA, and CHNS analysis. The electrical properties and conductivity of the nanocomposites were shown that are electro-active and semi-conductive. The morphology of the compounds was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) that revealed core–shell and nanosheet morphologies, respectively. Also, the effect of core–shell and nanosheet morphology, the presence of -SO 3 H group, and TiO 2 enhancer phase as a separate hole transition layer in solar cell and as an inorganic phase in nanocomposite matrix (active layer) on the power conversion efficiency of hybrid solar cells was investigated. Indeed, it is shown even a small amount of magnetic (nano)material [FeCl 2 , FeCl 3 , and/or high spin Fe (ii, iii) complexes] can increase the efficiency of the cell due to conversion of photogenerated state from spin singlet to triplet. Graphical abstract
Synthetic Metals, 2019
In recent years, the isomerization of the N]N double bonds in two forms, namely the cis (Z) and t... more In recent years, the isomerization of the N]N double bonds in two forms, namely the cis (Z) and trans (E) isomers, of aromatic azobenzenes have attracted great interest. It occurs readily both photochemically and thermally. Thus, aromatic azobenzenes are excellent candidates as molecular switches to build dynamic molecular devices. In this paper, synthesis of poly(p-aminoazobenzene) (PPAAB) 1 nanosheets as a new derivative of polyaniline containing azo groups by polymerization of diazoaminobenzene as the monomer was conducted in a new, simple and green condition with %72 yield. This is the first report of in-situ polymerization of p-aminoazobenzene (PAAB) with nanosheet morphology via one-pot route and without application of any template. The PPAAB was characterized and its properties were investigated. The photoisomerization process of the polymer was observed by UV-vis spectroscopy under irradiation at 380 nm for 2 h. This polymer demonstrated good thermal stability and the conductivity about 3.4 × 10 −4 S cm-1. The XRD analysis showed that the polymer has a semi-crystalline structure. SEM and TEM images also indicated the same results and demonstrated two-dimensional nanosheet morphology with sheet size ranging from 150 nm to several micrometers and thickness about 90 nm. Furthermore, the polymer solar cell (PSC) of PPAAB as FTO/TiO 2 /PPAAB/Al was fabricated and the power conversion efficiency (η) was obtained about 1.5%. The result showed that the PSC is completely efficient with a high η in comparison with similar cells in literature with less fabrication costing, simple structure, and under a green condition.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
علوم و تکنولوژی پلیمر, 2016
The novel conductive nanocomposite and composite from polyaniline (PANI) were prepared. The compo... more The novel conductive nanocomposite and composite from polyaniline (PANI) were prepared. The composites were synthesized by in situ oxidative chemical polymerization of aniline on silica- and nanosilica-supported sulfuric acid. The reaction was carried out in a mortar and ammonium persulfate was used as oxidant under solvent-free condition at room temperature. Structure, size and morphology of the synthesized nanocomposite and composite were determined by Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). Conductivity was measured by four-probe technique and revealed that the samples not only had the conductivity in the range of conductive polymers (~ 0.4 S/cm) but also they showed high conductivity as composites and blends of polyaniline reported by others. Synthesis of composites (nanocomposites) and formation of polarons were confirm...
Express Polymer Letters, 2020
The flower-like dendrimer and the nanosheet synthesis of polyaniline in the template-free method ... more The flower-like dendrimer and the nanosheet synthesis of polyaniline in the template-free method (rapid mixing) have been done successfully using p-aminoazobenzene (PAAB) and diazoaminobenzene (DAAB) as two new initiators, respectively. In both syntheses, the ammonium peroxydisulfate is used as an oxidant. The effect of initiators on the morphology is demonstrated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, and the mechanism of nanostructure formation is presented. The polymers are characterized by Fourier transform infrared (FT-IR) and Ultraviolet-visible (UV-vis) spectroscopies and elemental analysis (CHNS). Cyclic voltammetry (CV), electrical conductivity, X-ray diffraction (XRD) and thermogravimetric analysis (TGA) are also presented. Both polymers are semi-crystalline in nature and had the same thermal behavior.
Turkish Journal of Chemistry
The conformational and configurational behavior and the structure of N-2-(1,4-dioxane)-N-(p-methy... more The conformational and configurational behavior and the structure of N-2-(1,4-dioxane)-N-(p-methylbenzenesulfonyl)-O-(p-methylphenoxy) isourea (1) were studied using dynamic NMR. The endo-anomeric effect, hydrogen bonding, temperature, and polarity of solvent control the population of dioxane ring conformers or anomers but not the configuration interconversion of the imine of the imidoyl moiety. Dynamic 1 H-NMR, Δ H • , ΔS • , ΔG • , and ΔG ‡ analysis of 1 demonstrates that the dioxane ring adopts the chair conformation, that the imidoyl amino group prefers axial conformation, and that the tosyl and tolyl groups about the C=N bond retain the E configuration.
Chemistry Africa, Mar 20, 2024
Express Polymer Letters, 2022
The derivatives of polyaniline have obtained remarkable attention due to their electronic applica... more The derivatives of polyaniline have obtained remarkable attention due to their electronic applications in the field of nanomaterials. This work considers the electronic, structural, and photovoltaic properties of nanocomposites (POT/ WO 3 NPs) synthesized with three different ratios of poly(o-toluidine) and WO 3 nanoparticles [a-c (mol WO 3 /mol monomer) 100 = 60, 65, 70%] using a template-free method and a basic mechanochemical reaction in solid-state. The nanocomposites are analyzed and characterized by various spectroscopy methods. The prepared nanocomposites have core-shell morphology. The results of the band gap assessed via cyclic voltammetry and UV-vis specified that the forbidden band gap for (POT/WO 3 NPs) nanocomposite b [(mol WO 3 /mol monomer) 100 = 65%] are about 1.03 and 1.5-1.9 eV, respectively. The J-V analysis and power conversion efficiency of the fabricated devices FTO|TiO 2 NPs|POT|Al and FTO|TiO 2 NPs|POT/ WO 3 NPs (a-c) |Al single-layer solar cells are performed and discussed. The photovoltaic energy conversion efficiency (PCE) of the two devices are 0.18% and in average, 0.57%, respectively. The data show both indirect and direct transitions are observed for the WO 3 NPs, POT, and POT/WO 3 NP (b). This investigation demonstrates that the morphology and architecture of nanocomposites (POT/WO 3 NPs) can be helpful in improving solar cell performance.
Tetrahedron, Sep 1, 2007
The synthesis of primary carbamates from structurally diverse compounds containing a hydroxyl gro... more The synthesis of primary carbamates from structurally diverse compounds containing a hydroxyl group has been performed in high yields and purity, and without any epimerization under solvent-free conditions using HClO4–SiO2 as a mild, convenient, and effective reagent. The procedure is operationally simple, efficient, and environmentally benign.
Express Polymer Letters, 2021
In the present work, polyaniline-titanium (IV) oxide (PANI-TiO 2) nanocomposites have been synthe... more In the present work, polyaniline-titanium (IV) oxide (PANI-TiO 2) nanocomposites have been synthesized by solidstate (solvent-free) oxidative polymerization method of aniline as a monomer under green condition using both iron (III) chloride hexahydrate (FeCl 3 •6H 2 O) and ammonium peroxydisulfate (APS) as two different type of the oxidants as well as various modes and increasing of the ratios of monomer to oxidant. The structural and morphological of the nanocomposites have been characterized using kinetic and microscopic analysis. The electrical conductivities, cyclic voltammetry, bandgap energy (E g), and morphology of the nanocomposites are mainly dependent on the type of oxidants and reaction conditions. Also, the nanocomposites were shown electro-active and functional properties. The I-V characteristics of PANI-TiO 2 in an Al/(PANI-TiO 2)/TiO 2 /FTO solar cell are achieved by drawing the plot of the I-V curves. It is noted that nanocomposites with different conditions were shown similar FT-IR and UV-Vis spectra with different morphologies. The TEM images in different conditions showed a thin layer of TiO 2 nanoparticles in the outer wall of the nanotube when the APS was used as the oxidant, while when the FeCl 3 was used as the oxidant, the TiO 2 nanoparticles have been distributed on a plantain leaf of PANI matrix. The XRD results confirm completely results obtained from TEM. As a result, the nanocomposites with both methods showed a good P-N junction between TiO 2 and PANI.
ChemInform, Jun 7, 2010
A Facile and Efficient Method for the One-Pot Synthesis of Per-O-Acetylated Thioglycosides from U... more A Facile and Efficient Method for the One-Pot Synthesis of Per-O-Acetylated Thioglycosides from Unprotected Sugars.-Acetylation of various unprotected sugars, including 2-deoxy-2-amino sugars, sialic acid, lactose, and maltose, with a stoichiometric amount of acetic anhydride followed by thioglycosidation with thiocresol furnishes the corresponding thioglycosides in good to high yield under solvent-free conditions.-(
Journal of Power Sources, Sep 1, 2022
Turkish Journal of Chemistry, 2009
A simple and efficient method for the preparation of 5-arylamino-1 H (2 H)-tetrazoles (3a-i) and ... more A simple and efficient method for the preparation of 5-arylamino-1 H (2 H)-tetrazoles (3a-i) and 5-amino-1-ary-1 H− tetrazoles (4a-i), with excellent yields and high purity, from secondary arylcyanamides (1a-i) at room temperature in glacial acetic acid is described. Tautomers 3a-i were separated from tautomers 4a-i by crystallization in ethanol. A mechanism was introduced in glacial acetic acid. The ratio of isomers is described based on the electronic and steric effects of various substituents. The electron withdrawing group (-NO 2) increased the ratio of 4:3. The rate of product formation was enhanced by introducing electron donating substituents. 1 H-NMR and 13 C-NMR chemical shifts and multiplicities are also discussed.
Journal of The Iranian Chemical Society, Mar 1, 2006
The conformational, configurational behavior and the structure of N-2-(1,4-dioxane)-N'-(4-methylb... more The conformational, configurational behavior and the structure of N-2-(1,4-dioxane)-N'-(4-methylbenzenesulfonyl)-O-(4methylphenoxy) isourea 1 has been studied using ab initio and semiempirical calculations (AM1 and PM3). The endo-anomeric effect and hydrogen bonds control the population of dioxane ring conformers or anomers but not the configuration interconversion of the imine of imidoyl moiety. Ab initio and AM1 and PM3 calculations demonstrate that the dioxane ring adopts a chair conformation, that the imidoyl amino group prefers an axial conformation and that the tosyl and tolyl groups about the C=N bond retain an E configuration. The computational analysis of 1 complements the X-ray findings.
Journal of Basic & Applied Sciences, 2021
The objective of this research is the synthesis and characterization of the novel composite of p... more The objective of this research is the synthesis and characterization of the novel composite of poly(o-methoxyaniline)/silica-supported sulfuric acid (POMA-SSSA). The synthesis is done by doping of poly (o-methoxyaniline) emeraldine base in the presence of silica-supported sulfuric acid (SiO2-H2SO4, SSSA) under solid-state (solvent-free) conditions. Herein, poly(o-methoxyaniline) emeraldine salt (POMA-SA) is prepared simply by mixing the base form with H2SO4 in solid-state. The doping process is verified by ultraviolet-visible, Fourier transform infrared spectroscopy and elemental analysis. It is shown that the polymers and composites have maximum doping and the doping counter ion in POMA-SA and POMA-SSSA-bw (before work-up) is HSO4– and in the POMA-SSSA-aw (after work-up) is SO42-. The prepared composites show good conductivity. Scanning electron microscopy (SEM) images show that POMA molecules thoroughly have coated the surface of silica. Moreover, the morphology studies of compos...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Composite Fenton nanocatalyst was prepared by water-based in situ creation of Fe3O4 nanoparticles... more Composite Fenton nanocatalyst was prepared by water-based in situ creation of Fe3O4 nanoparticles integrated within self-assembly 3D reduced graphene oxide (rGO) aerogel. It was used for degradation of Acid Green 25 (AG-25) organic dye in aqueous solution, in presence of H2O2. By investigating the conditions that maximize the dye adsorption by the 3D composite, it was found that the pH of the solution should be adjusted between the pKa of the functional groups presented on the rGO surface (carboxylic acid) and that of the dye (sulfonic acid) to promote electrostatic interactions dye − 3D structure. Performed under these conditions, Fenton degradation of AG-25 in presence of H2O2 was completed in less than 30 min, including all the intermediate products, as demonstrated by MALDI-TOF-MS analysis of the aqueous solution after discoloration. Moreover, this was achieved in a solution with as high dye concentration as 0.5 mg/mL, with only 10 mg of 3D composite catalyst, at room temperatur...
Polymer Bulletin, 2021
In this article, novel nanocomposites of poly( 3 - or m -aminobenzenesulfonic acid) and TiO 2 wer... more In this article, novel nanocomposites of poly( 3 - or m -aminobenzenesulfonic acid) and TiO 2 were synthesized by very simple in-situ polymerization of monomer ( m -ABS) by FeCl 3 .6H 2 O as an oxidant and TiO 2 particles as inorganic phase under solid-state condition. The combination of N-type TiO 2 and P-type PABS led to the preparation of two new P–N junction type nanocomposites. The polymer-hybrid solar cells were fabricated using the nanocomposites as FTO/TiO 2 / NCPABS- TiO 2 /Al and under simulated solar irradiation demonstrated power conversion efficiencies ( PCE , η ) about 1%. The other advantages of this work were fewer fabrication costs, ease-of-processing, green synthesis condition, a simple structure of the solar cell (single layer), and the high stability of the resulted cells. The synthesized nanocomposites ( NCPABS-TiO 2 -1 and 2 ) were characterized by FT-IR, UV–vis, VSM, XRD, CV, TGA, and CHNS analysis. The electrical properties and conductivity of the nanocomposites were shown that are electro-active and semi-conductive. The morphology of the compounds was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) that revealed core–shell and nanosheet morphologies, respectively. Also, the effect of core–shell and nanosheet morphology, the presence of -SO 3 H group, and TiO 2 enhancer phase as a separate hole transition layer in solar cell and as an inorganic phase in nanocomposite matrix (active layer) on the power conversion efficiency of hybrid solar cells was investigated. Indeed, it is shown even a small amount of magnetic (nano)material [FeCl 2 , FeCl 3 , and/or high spin Fe (ii, iii) complexes] can increase the efficiency of the cell due to conversion of photogenerated state from spin singlet to triplet. Graphical abstract
Synthetic Metals, 2019
In recent years, the isomerization of the N]N double bonds in two forms, namely the cis (Z) and t... more In recent years, the isomerization of the N]N double bonds in two forms, namely the cis (Z) and trans (E) isomers, of aromatic azobenzenes have attracted great interest. It occurs readily both photochemically and thermally. Thus, aromatic azobenzenes are excellent candidates as molecular switches to build dynamic molecular devices. In this paper, synthesis of poly(p-aminoazobenzene) (PPAAB) 1 nanosheets as a new derivative of polyaniline containing azo groups by polymerization of diazoaminobenzene as the monomer was conducted in a new, simple and green condition with %72 yield. This is the first report of in-situ polymerization of p-aminoazobenzene (PAAB) with nanosheet morphology via one-pot route and without application of any template. The PPAAB was characterized and its properties were investigated. The photoisomerization process of the polymer was observed by UV-vis spectroscopy under irradiation at 380 nm for 2 h. This polymer demonstrated good thermal stability and the conductivity about 3.4 × 10 −4 S cm-1. The XRD analysis showed that the polymer has a semi-crystalline structure. SEM and TEM images also indicated the same results and demonstrated two-dimensional nanosheet morphology with sheet size ranging from 150 nm to several micrometers and thickness about 90 nm. Furthermore, the polymer solar cell (PSC) of PPAAB as FTO/TiO 2 /PPAAB/Al was fabricated and the power conversion efficiency (η) was obtained about 1.5%. The result showed that the PSC is completely efficient with a high η in comparison with similar cells in literature with less fabrication costing, simple structure, and under a green condition.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
علوم و تکنولوژی پلیمر, 2016
The novel conductive nanocomposite and composite from polyaniline (PANI) were prepared. The compo... more The novel conductive nanocomposite and composite from polyaniline (PANI) were prepared. The composites were synthesized by in situ oxidative chemical polymerization of aniline on silica- and nanosilica-supported sulfuric acid. The reaction was carried out in a mortar and ammonium persulfate was used as oxidant under solvent-free condition at room temperature. Structure, size and morphology of the synthesized nanocomposite and composite were determined by Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). Conductivity was measured by four-probe technique and revealed that the samples not only had the conductivity in the range of conductive polymers (~ 0.4 S/cm) but also they showed high conductivity as composites and blends of polyaniline reported by others. Synthesis of composites (nanocomposites) and formation of polarons were confirm...
Express Polymer Letters, 2020
The flower-like dendrimer and the nanosheet synthesis of polyaniline in the template-free method ... more The flower-like dendrimer and the nanosheet synthesis of polyaniline in the template-free method (rapid mixing) have been done successfully using p-aminoazobenzene (PAAB) and diazoaminobenzene (DAAB) as two new initiators, respectively. In both syntheses, the ammonium peroxydisulfate is used as an oxidant. The effect of initiators on the morphology is demonstrated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, and the mechanism of nanostructure formation is presented. The polymers are characterized by Fourier transform infrared (FT-IR) and Ultraviolet-visible (UV-vis) spectroscopies and elemental analysis (CHNS). Cyclic voltammetry (CV), electrical conductivity, X-ray diffraction (XRD) and thermogravimetric analysis (TGA) are also presented. Both polymers are semi-crystalline in nature and had the same thermal behavior.
Turkish Journal of Chemistry
The conformational and configurational behavior and the structure of N-2-(1,4-dioxane)-N-(p-methy... more The conformational and configurational behavior and the structure of N-2-(1,4-dioxane)-N-(p-methylbenzenesulfonyl)-O-(p-methylphenoxy) isourea (1) were studied using dynamic NMR. The endo-anomeric effect, hydrogen bonding, temperature, and polarity of solvent control the population of dioxane ring conformers or anomers but not the configuration interconversion of the imine of the imidoyl moiety. Dynamic 1 H-NMR, Δ H • , ΔS • , ΔG • , and ΔG ‡ analysis of 1 demonstrates that the dioxane ring adopts the chair conformation, that the imidoyl amino group prefers axial conformation, and that the tosyl and tolyl groups about the C=N bond retain the E configuration.