The Experts below are selected from a list of 1410 Experts worldwide ranked by ideXlab platform
Rudolf Holze - One of the best experts on this subject based on the ideXlab platform.
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a comparative study of the uv vis spectroelectrochemical behavior of 2 and 3 Methylaniline during homo and copolymerization with 1 2 diaminobenzene
Electrochimica Acta, 2013Co-Authors: Salma Bilal, Anwarulhaq Ali Shah, Rudolf HolzeAbstract:Abstract This paper evaluates comparatively the behavior of 2-Methylaniline (2-MA) and 3-Methylaniline (3-MA) in a UV–vis spectroelectrochemical study of their homo- as well as copolymerization with 1,2-diaminobenzene (1,2-DAB). The homopolymers poly(2-Methylaniline) (P2-MA) and poly(3-Methylaniline) (P3-MA) show similar spectroelectrochemical properties. However, differences were observed in the properties between the copolymers of 2-MA and 3-MA with 1,2-DAB that could be due to the variation in the monomer units and orientation along the copolymer chains. The formation of head-to-tail coupled p-aminodiphenylamine (PPD) type of mixed dimers/oligomers, presumably resulting from the dimerization of 1,2-DAB and 2-MA or 3-MA cation radicals, is proposed. An absorption peak around λ = 497 nm in the UV–vis spectra is assigned to these intermediates. A mechanism is proposed for the growth of the copolymers. Characteristic UV–vis features of the copolymers have been identified and their dependencies on the electrode potential are discussed. Clear variations in spectroelectrochemical properties of the materials from mixed solutions can be observed just by varying the concentration of 1,2-DAB and by replacing 3-MA with 2-MA in the feed. One of the possible reason for the difference in the properties of the copolymers of 2-MA and 3-MA might be the effect of the electron-donating methyl group in meta-position resulting in an increased electron density in the second meta-position contributing to meta-coupling of radical cations.
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a comparative study of the electrochemical behavior of 2 3 Methylaniline during homo and copolymerization with 1 2 diaminobenzene
Electrochimica Acta, 2012Co-Authors: Salma Bilal, Anwarulhaq Ali Shah, Rudolf HolzeAbstract:Abstract An attempt has been made to evaluate comparatively the behavior of 2-Methylaniline (2MA) and 3-Methylaniline (3MA) during electrochemical homo- and copolymerization. As comonomer in the copolymerization bath with 2MA and 3MA 1,2-diaminobenzene (1,2-DAB), an aromatic diamine, was selected. Cyclic voltammetry was used both for the electrochemical synthesis and characterization of the homopolymers and copolymers on a gold electrode. In the copolymerization bath mixed solutions of the monomers having different concentrations of 1,2-DAB and a constant concentration of 2MA or 3MA were used. The voltammograms exhibit different behavior for different concentration ratios of the monomer in the feed. The homopolymers poly(2-Methylaniline) (P2MA) and poly(3-Methylaniline) (P3MA) show similar electrochemical properties. However, differences were observed in the properties between the copolymers of 2MA and 3MA with 1,2-DAB that could be due to the variation in the monomer units and orientation along the copolymer chains. The copolymerization of 1,2-DAB seems to be more facilitated when instead of 3MA, 2MA is present as comonomers. The effect of scan rate and pH on the electrochemical activity was studied. The copolymers are surface confined, electroactive and show good electrochemical activity even at pH = 8.0 and pH = 9.0 in case of poly(1,2-DAB-co-3MA) and poly(1,2-DAB-co-2MA), respectively. In situ conductivity measurements further support the differences in the structure of the copolymers of 1,2-DAB with 2MA and 3MA.
I B Abdrakhmanov - One of the best experts on this subject based on the ideXlab platform.
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synthesis of 2 bromo 8 methylspiro 4h 3 1 benzooxazine 4 1 cyclopentan 2 1h one and 2 amino 2 bromo 8 methylspiro 4h 3 1 benzooxazine 4 1 cyclopentane from 6 cyclopent 1 enyl 2 Methylaniline
Russian Chemical Bulletin, 2001Co-Authors: R R Gataullin, I Afon S Kin, A A Fatykhov, L V Spirikhin, I B AbdrakhmanovAbstract:The reaction of 6-(cyclopent-1-enyl)-N-ethoxycarbonyl-2-Methylaniline with Br2 or its reaction with NH3 followed by the reaction with Br2 afforded 2"-bromo-8-methylspiro(4H-3,1-benzooxazine-4,1"-cyclopentan)-2(1H)-one and 2-amino-2"-bromo-8-methylspiro(4H-3,1-benzooxazine-4,1"-cyclopentane), respectively.
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intramolecular cyclization ofn acetyl 6 cyclopent 1 enyl 2 Methylaniline
Russian Chemical Bulletin, 1999Co-Authors: R R Gataullin, I S Afonkin, I V Pavlova, I B Abdrakhmanov, G A TolstikovAbstract:N-Acetyl-6-(cyclopent-1-enyl)-2-Methylaniline underwent intramolecular cyclization in the presence of HCl in CH2Cl2 at 20°C to form 2,8-dimethylspiro[cyclopentane-1,4′-4′H-3,1-benzooxazine] in quantitative yield.
R R Gataullin - One of the best experts on this subject based on the ideXlab platform.
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synthesis of 2 bromo 8 methylspiro 4h 3 1 benzooxazine 4 1 cyclopentan 2 1h one and 2 amino 2 bromo 8 methylspiro 4h 3 1 benzooxazine 4 1 cyclopentane from 6 cyclopent 1 enyl 2 Methylaniline
Russian Chemical Bulletin, 2001Co-Authors: R R Gataullin, I Afon S Kin, A A Fatykhov, L V Spirikhin, I B AbdrakhmanovAbstract:The reaction of 6-(cyclopent-1-enyl)-N-ethoxycarbonyl-2-Methylaniline with Br2 or its reaction with NH3 followed by the reaction with Br2 afforded 2"-bromo-8-methylspiro(4H-3,1-benzooxazine-4,1"-cyclopentan)-2(1H)-one and 2-amino-2"-bromo-8-methylspiro(4H-3,1-benzooxazine-4,1"-cyclopentane), respectively.
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intramolecular cyclization ofn acetyl 6 cyclopent 1 enyl 2 Methylaniline
Russian Chemical Bulletin, 1999Co-Authors: R R Gataullin, I S Afonkin, I V Pavlova, I B Abdrakhmanov, G A TolstikovAbstract:N-Acetyl-6-(cyclopent-1-enyl)-2-Methylaniline underwent intramolecular cyclization in the presence of HCl in CH2Cl2 at 20°C to form 2,8-dimethylspiro[cyclopentane-1,4′-4′H-3,1-benzooxazine] in quantitative yield.
Salma Bilal - One of the best experts on this subject based on the ideXlab platform.
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one pot synthesis of highly thermally stable poly 2 Methylaniline for corrosion protection of stainless steel
Iranian Journal of Science and Technology Transaction A-science, 2018Co-Authors: Salma Bilal, Hajera Gul, Salma Gul, Anwarulhaq Ali ShahAbstract:This paper reports on the synthesis and characterization of poly(2-Methylaniline), PmA, a derivative of a very fascinating electronically conducting polymer polyaniline. PmA was synthesized in its salt form by one pot emulsion polymerization route using DBSA and sulfuric acid as co-dopants. Fourier transform infrared spectroscopy and Ultraviolet visible spectroscopic analysis confirmed formation of conducting emeraldine salt form of PmA. These PmA salts showed good redox reversibility and high purity. Thermogravimetric analysis revealed very good thermal stability up to 520 °C which is the highest reported thermal stability for PmA so far. Potentiodynamic polarization measurements clearly revealed that the PmA acts as corrosion protective coating on stainless steel with the protection efficiency of 55.59%.
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a comparative study of the uv vis spectroelectrochemical behavior of 2 and 3 Methylaniline during homo and copolymerization with 1 2 diaminobenzene
Electrochimica Acta, 2013Co-Authors: Salma Bilal, Anwarulhaq Ali Shah, Rudolf HolzeAbstract:Abstract This paper evaluates comparatively the behavior of 2-Methylaniline (2-MA) and 3-Methylaniline (3-MA) in a UV–vis spectroelectrochemical study of their homo- as well as copolymerization with 1,2-diaminobenzene (1,2-DAB). The homopolymers poly(2-Methylaniline) (P2-MA) and poly(3-Methylaniline) (P3-MA) show similar spectroelectrochemical properties. However, differences were observed in the properties between the copolymers of 2-MA and 3-MA with 1,2-DAB that could be due to the variation in the monomer units and orientation along the copolymer chains. The formation of head-to-tail coupled p-aminodiphenylamine (PPD) type of mixed dimers/oligomers, presumably resulting from the dimerization of 1,2-DAB and 2-MA or 3-MA cation radicals, is proposed. An absorption peak around λ = 497 nm in the UV–vis spectra is assigned to these intermediates. A mechanism is proposed for the growth of the copolymers. Characteristic UV–vis features of the copolymers have been identified and their dependencies on the electrode potential are discussed. Clear variations in spectroelectrochemical properties of the materials from mixed solutions can be observed just by varying the concentration of 1,2-DAB and by replacing 3-MA with 2-MA in the feed. One of the possible reason for the difference in the properties of the copolymers of 2-MA and 3-MA might be the effect of the electron-donating methyl group in meta-position resulting in an increased electron density in the second meta-position contributing to meta-coupling of radical cations.
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a comparative study of the electrochemical behavior of 2 3 Methylaniline during homo and copolymerization with 1 2 diaminobenzene
Electrochimica Acta, 2012Co-Authors: Salma Bilal, Anwarulhaq Ali Shah, Rudolf HolzeAbstract:Abstract An attempt has been made to evaluate comparatively the behavior of 2-Methylaniline (2MA) and 3-Methylaniline (3MA) during electrochemical homo- and copolymerization. As comonomer in the copolymerization bath with 2MA and 3MA 1,2-diaminobenzene (1,2-DAB), an aromatic diamine, was selected. Cyclic voltammetry was used both for the electrochemical synthesis and characterization of the homopolymers and copolymers on a gold electrode. In the copolymerization bath mixed solutions of the monomers having different concentrations of 1,2-DAB and a constant concentration of 2MA or 3MA were used. The voltammograms exhibit different behavior for different concentration ratios of the monomer in the feed. The homopolymers poly(2-Methylaniline) (P2MA) and poly(3-Methylaniline) (P3MA) show similar electrochemical properties. However, differences were observed in the properties between the copolymers of 2MA and 3MA with 1,2-DAB that could be due to the variation in the monomer units and orientation along the copolymer chains. The copolymerization of 1,2-DAB seems to be more facilitated when instead of 3MA, 2MA is present as comonomers. The effect of scan rate and pH on the electrochemical activity was studied. The copolymers are surface confined, electroactive and show good electrochemical activity even at pH = 8.0 and pH = 9.0 in case of poly(1,2-DAB-co-3MA) and poly(1,2-DAB-co-2MA), respectively. In situ conductivity measurements further support the differences in the structure of the copolymers of 1,2-DAB with 2MA and 3MA.
V K Sharma - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic properties of ternary mixtures containing ionic liquid and organic liquids excess molar volume and excess isentropic compressibility
Journal of Chemical & Engineering Data, 2014Co-Authors: V K Sharma, S Solanki, S BhagourAbstract:Densities, ρ123, and speeds of sound, u123, of 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + 2-Methylaniline (2) + pyridine or α-, β-, or γ-picoline (3) ternary mixtures have been measured over the entire range of composition at 293.15 K, 298.15 K, 303.15 K, and 308.15 K using density and speed of sound analyzer (Anton Paar DSA 5000). The heat capacity, Cp, of pure liquids pyridine and α-, β-, and γ-picoline have also been measured at 293.15 K, 298.15 K, 303.15 K, and 308.15 K using differential scanning calorimeter. The measured data have been employed to determine excess molar volumes, V123E and excess isentropic compressibilities,(κSE)123. The V123E and(κSE)123 data have been fitted to Redlich–Kister equation to calculate ternary adjustable parameters and standard deviations. The thermodynamic properties of the ternary mixtures have been analyzed in terms of Graph (which deals with the topology of the constituent of mixtures) and Prigogine-Flory-Patterson (PFP) theories. It has been observed that...
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excess molar enthalpies for binary and ternary mixtures containing cyclic ether 2 Methylaniline and aromatic hydrocarbons
Thermochimica Acta, 2012Co-Authors: Sunil K Jangra, J S Yadav, V K SharmaAbstract:Abstract Excess molar enthalpies, H ijk E , of 1,4-dioxane (i) + 2-Methylaniline (j) + benzene or methylbenzene or 1,3-dimethylbenzene or 1,4-dimethylbenzene (k) ternary and H ik E of 1,4-dioxane (i) + 1,3-dimethylbenzene or 1,4-dimethylbenzene (k) binary mixtures have been measured as a function of composition at T = 308.15 K using 2-drop calorimeter. The resulting data have been fitted to Redlich–Kister equation to evaluate binary and ternary parameters along with their standard deviations. The observed data have been analyzed in terms of (a) Graph theory (which involve the topology of the mixtures constituents), and (b) Prigogine–Flory–Patterson theory. It has been observed that H ik E and H ijk E values predicted by Graph theory compare well with their corresponding experimental values. However, although H ijk E values calculated by Prigogine–Flory–Patterson theory are of same sign, the qualitative agreement is not impressive.
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molar excess volumes and excess isentropic compressibilities of 2 Methylaniline i benzene j methylbenzene 2 Methylaniline i benzene j 1 2 dimethylbenzene k and 2 Methylaniline i benzene j 1 4 dimethylbenzene k at t 308 15 k
Journal of Chemical & Engineering Data, 2009Co-Authors: J S Yadav, K C Singh, V K SharmaAbstract:Molar excess volumes, VEijk, and speeds of sound, Uijk, of {2-Methylaniline (i) + benzene (j) + methylbenzene (k)}, {2-Methylaniline (i) + benzene (j) + 1,2-dimethylbenzene (k)}, and {2-Methylaniline (i) + benzene (j) + 1,4-dimethylbenzene (k)} have been measured as a function of composition at a temperature of 308.15 K. The observed speeds of sound data have been utilized to determine excess isentropic compressibilities, κS ijkE of ternaries (i + j + k).
