The Experts below are selected from a list of 36351 Experts worldwide ranked by ideXlab platform
Abdullah M Asiri - One of the best experts on this subject based on the ideXlab platform.
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synthesis characterization and determination of third order optical nonlinearity by cw z scan technique of novel thiobarbituric acid derivative dyes
Materials Letters, 2015Co-Authors: M A N Razvi, Ahmed H Bakry, S M Afzal, Salman A Khan, Abdullah M AsiriAbstract:Abstract Donor acceptor chromophores were prepared by Knovenagel reaction of 1,3-diethyl-2-thiobarbituric acid with corresponding aldehydes in ethanol using pyridine as catalyst. The structures of newly synthesized compounds were evaluated by FT-IR, 1 H NMR, 13 C NMR, MS spectroscopy and purity of the compounds were confirmed by elemental analyses. The nonlinear refractive index n 2 and nonlinear absorption coefficient β are measured for these dyes using the closed and open aperture z -scan technique with a cw He–Ne laser at 632.8 nm. These values are found to be high and Linearly Dependent on the concentration.
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synthesis characterization and determination of third order optical nonlinearity by cw z scan technique of novel thiobarbituric acid derivative dyes
Materials Letters, 2015Co-Authors: M A N Razvi, Ahmed H Bakry, S M Afzal, Salman A Khan, Abdullah M AsiriAbstract:Donor acceptor chromophores were prepared by Knovenagel reaction of 1,3-diethyl-2-thiobarbituric acid with corresponding aldehydes in ethanol using pyridine as catalyst. The structures of newly synthesized compounds were evaluated by FT-IR, H-1 NMR, C-13 NMR, MS spectroscopy and purity of the compounds were confirmed by elemental analyses. The nonlinear refractive index n(2) and nonlinear absorption coefficient beta are measured for these dyes using the closed and open aperture z-scan technique with a cw He-Ne laser at 632.8 nm. These values are found to be high and Linearly Dependent on the concentration
S M Afzal - One of the best experts on this subject based on the ideXlab platform.
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synthesis characterization and determination of third order optical nonlinearity by cw z scan technique of novel thiobarbituric acid derivative dyes
Materials Letters, 2015Co-Authors: M A N Razvi, Ahmed H Bakry, S M Afzal, Salman A Khan, Abdullah M AsiriAbstract:Abstract Donor acceptor chromophores were prepared by Knovenagel reaction of 1,3-diethyl-2-thiobarbituric acid with corresponding aldehydes in ethanol using pyridine as catalyst. The structures of newly synthesized compounds were evaluated by FT-IR, 1 H NMR, 13 C NMR, MS spectroscopy and purity of the compounds were confirmed by elemental analyses. The nonlinear refractive index n 2 and nonlinear absorption coefficient β are measured for these dyes using the closed and open aperture z -scan technique with a cw He–Ne laser at 632.8 nm. These values are found to be high and Linearly Dependent on the concentration.
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synthesis characterization and determination of third order optical nonlinearity by cw z scan technique of novel thiobarbituric acid derivative dyes
Materials Letters, 2015Co-Authors: M A N Razvi, Ahmed H Bakry, S M Afzal, Salman A Khan, Abdullah M AsiriAbstract:Donor acceptor chromophores were prepared by Knovenagel reaction of 1,3-diethyl-2-thiobarbituric acid with corresponding aldehydes in ethanol using pyridine as catalyst. The structures of newly synthesized compounds were evaluated by FT-IR, H-1 NMR, C-13 NMR, MS spectroscopy and purity of the compounds were confirmed by elemental analyses. The nonlinear refractive index n(2) and nonlinear absorption coefficient beta are measured for these dyes using the closed and open aperture z-scan technique with a cw He-Ne laser at 632.8 nm. These values are found to be high and Linearly Dependent on the concentration
A B P Lever - One of the best experts on this subject based on the ideXlab platform.
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tuning metalloporphyrin and metallophthalocyanine redox potentials using ligand electrochemical el and hammett σp parametrization
Coordination Chemistry Reviews, 2001Co-Authors: Christos Alexiou, A B P LeverAbstract:Abstract A compilation and analysis of literature values for a number of iron and chromium tetraphenylporphyrins shows that there is a linear correlation between observed M III/II potentials and the total contribution of the axial ligand electrochemical parameters, ∑ E L (L). Substituted iron and chromium phthalocyanine adducts in different coordinating solvents indicate that the potential of the M III/II redox couple is Linearly Dependent on ∑ E L (L) and on the total Hammett para substituent constant, ∑ σ p . The application of this electrochemical model to the design of metallomacrocycles possessing desired values of E 1/2 is discussed.
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derivation of metallophthalocyanine redox potentials via hammett parameter analysis
Inorganica Chimica Acta, 1993Co-Authors: A B P LeverAbstract:Six redox processes of metal-free, cobalt and zinc substituted phthalocyanines are shown to be Linearly Dependent on the total Hammett substituent constant, Σσp. The slopes of the linear free energy relationships are in the range 0.10-0.15 V/Σσp.
Shadpour Mallakpour - One of the best experts on this subject based on the ideXlab platform.
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n 3 4 dihydroxyphenethyl 3 5 dinitrobenzamide modified multiwall carbon nanotubes paste electrode as a novel sensor for simultaneous determination of penicillamine uric acid and tryptophan
Electroanalysis, 2011Co-Authors: Ali A Ensafi, Hassan Karimimaleh, Shadpour MallakpourAbstract:N-(3,4-dihydroxyphenethyl)-3,5-dinitrobenzamide modified multiwall carbon nanotubes paste electrode was used as a voltammetric sensor for oxidation of penicillamine (PA), uric acid (UA) and tryptophan (TP). In a mixture of PA, UA and TP, those voltammograms were well separated from each other with potential differences of 300, 610, and 310 mV, respectively. The peak currents were Linearly Dependent on PA, UA and TP concentrations in the range of 0.05–300, 5–420, and 1.0–400 µmol L−1, with detection limits of 0.021, 2.0, and 0.82 µmol L−1, respectively. The modified electrode was used for the determination of those compounds in real samples.
Ali A Ensafi - One of the best experts on this subject based on the ideXlab platform.
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n 3 4 dihydroxyphenethyl 3 5 dinitrobenzamide modified multiwall carbon nanotubes paste electrode as a novel sensor for simultaneous determination of penicillamine uric acid and tryptophan
Electroanalysis, 2011Co-Authors: Ali A Ensafi, Hassan Karimimaleh, Shadpour MallakpourAbstract:N-(3,4-dihydroxyphenethyl)-3,5-dinitrobenzamide modified multiwall carbon nanotubes paste electrode was used as a voltammetric sensor for oxidation of penicillamine (PA), uric acid (UA) and tryptophan (TP). In a mixture of PA, UA and TP, those voltammograms were well separated from each other with potential differences of 300, 610, and 310 mV, respectively. The peak currents were Linearly Dependent on PA, UA and TP concentrations in the range of 0.05–300, 5–420, and 1.0–400 µmol L−1, with detection limits of 0.021, 2.0, and 0.82 µmol L−1, respectively. The modified electrode was used for the determination of those compounds in real samples.
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simultaneous determination of dopamine and uric acid by electrocatalytic oxidation on a carbon paste electrode using pyrogallol red as a mediator
Analytical Letters, 2010Co-Authors: Ali A Ensafi, A Arabzadeh, Hassan KarimimalehAbstract:A sensitive and selective electrochemical method for the simultaneous determination of dopamine (DA) and uric acid (UA) was developed using a pyrogallol red modified carbon paste electrode. Under the optimized conditions, the peak current was Linearly Dependent on 1.0–700.0 μmol L−1 DA and 50.0–1000.0 μmol L−1 UA. The detection limits for DA and UA were 0.78 μmol L−1 and 35 μmol L−1, respectively. Finally, this method was also examined for the determination of DA and uric acid in real samples such as drugs and urine.
