Results 81 to 90 of about 300,019 (196)

Electronic Excited State Redox Properties for BODIPY Dyes Predicted from Hammett Constants: Estimating the Driving Force of Photoinduced Electron Transfer

, 2016
Here we formulate equations based solely on empirical Hammett substituent constants to predict the redox potentials for the electronic excited state of boron-dipyrromethene (BODIPY) dyes.
Richard Lincoln (1411441), Zhutian Ding (1720612), Katerina Krumova (1720609), Gonzalo Cosa (1361649), Lana E. Greene (1411438)   +4 more
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Equilibrium constants and protonation site for N-methylbenzenesulfonamides

Beilstein Journal of Organic Chemistry, 2011
The protonation equilibria of four substituted N-methylbenzenesulfonamides, X-MBS: X = 4-MeO (3a), 4-Me (3b), 4-Cl (3c) and 4-NO2 (3d), in aqueous sulfuric acid were studied at 25 °C by UV–vis spectroscopy.
José A. Moreira, Ana M. Rosa da Costa, Luis García-Río, Márcia Pessêgo   +3 more
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Picolinic acid promoted oxidative decarboxylation of phenylsulfinylacetic acid by Cr(VI)

Bulletin of the Chemical Society of Ethiopia, 2016
The kinetics and mechanism of picolinic acid promoted reaction of phenylsulfinylacetic acid (PSAA) with Cr(VI) was carried out in aqueous acetonitrile medium under pseudo first order conditions. The reaction follows Michaelis-Menten type of kinetics with
P. Subramaniam, N. T. Selvi
doaj   +1 more source

Hammett Analysis of a Family of Carbene−Carbene Complex Equilibria

, 2016
p-X-substituted phenylchlorocarbenes (X = NO2, CF3, Cl, H, Me, and MeO) form π-type complexes with trimethoxybenzene in pentane. The carbenes and complexes are in equilibrium, and logarithms of the measured equilibrium constants are well correlated by ...
Karsten Krogh-Jespersen (1397983), Lei Wang (6656), Jack Thompson (2088838), Robert A. Moss (1397986)   +3 more
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Quantitative Analysis of Substituent Effects in Cu(II) and Co(II) Benzimidazole Complexes: Stability Constants Determined via Acetate-Mediated Synthesis and Benesi–Hildebrand Method Correlated with Hammett σ Parameters

Chemistry
This study presents a quantitative investigation of substituent effects on the stability of 1:2 complexes formed between para-substituted 2-phenylbenzimidazole ligands and Cu(II) or Co(II) ions.
Zoltán Köntös, Flóra Stedra, Viktória Ngo Hang   +2 more
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Oral Interview of Anne G. Hammett [PDF]

, 1974
Anne G. Hammett discusses her early education in Glyndon, Minnesota, and then at the Agricultural College of North Dakota and Minnesota State Teachers College.
Hammett, Anne G.
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Spectroscopic determination of acid dissociation constants of some imidazole derivatives

, 2001
The acid dissociation constants, pK(a), of eight biologically active imidazole derivatives were determined using a spectroscopic technique. Using the obtained acid dissociation constants, attempts were made to elucidate the structures and protonation ...
Öğretir, Cemil, Berber, Halil, Ogretir, C, Oktay Asutay, Asutay, O, Berber, H, Asutay, Oktay, Öğretır, Cemi̇l, Halil Berber, Cemi̇l Öğretır, Cemil Öǧretir   +10 more
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Employment of quantum chemical descriptors for Hammett constants: Revision Suggested for the acetoxy substituent

, 2013
The Hammett para constant (sigma(p)) of the acetoxy group has been estimated by applying widely available quantum chemical descriptors, such as NPA charges, Wiberg bond indices, electron densities at bond critical points, as well as electrostatic ...
Kégl, Tamás, Papp, Tamara, Kollár, László   +2 more
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Euell Hammett oral history interview.

, 2007
Oral history interview with Euell Hammett conducted by David Marshall and Andy Wilkinson on Sept. 4, 2007, in Odessa, Tex. Accompanied by 1 finding aid.Euell Hammett talks about his life, ranch experiences, and remembrances of the Johnson ...

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H.P. Hammett to James C. Furman

, 1884
A two page letter from H.P.
Hammett, H. P.
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