Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Donald F. Sears"'
Publikováno v:
Photochemical & Photobiological Sciences. 2:1162-1168
A matrix of trans-1-(2-naphthyl)-1-phenylethene (t-NPE) fluorescence spectra obtained from benzene solutions at 20 degrees C by varying the excitation wavelength (lambdaexc) and the oxygen concentration is resolved into pure conformer fluorescence sp
Publikováno v:
The Journal of Physical Chemistry A. 105:7569-7578
based on the van’t Hoff equation constraint, were applied to 1,3-butadiene UV spectra measured in the 5.0 93.0 °C range. The shape of the resolved UV spectrum of the high-energy conformer of 1,3-butadiene is sensitive to broadening of the spectra
Autor:
Bruno M. Vittimberga, Donald F. Sears
Publikováno v:
Journal of Heterocyclic Chemistry. 38:285-291
The physical and photophysical properties of 6-phenanthridinecarbonitrile (1) have been examined. We previously reported that when 1 is irradiated in aqueous 2-propanol, three products are formed [3]. These include dimethyl-6-phenanthridinylcarbinol
Autor:
Donald F. Sears, Bruno M. Vittimberga
Publikováno v:
Journal of Heterocyclic Chemistry. 37:291-295
When 6-phenanthridinecarbonitrile (3) is irradiated at 2537 A in neutral 9:1 2-propanol/water, three major products are formed. These are dimethyl-(6-phenanthridinyl)methanol (4), phenanthridine (5) and 6,6′-biphenanthridine (6). When benzophenone
Autor:
Donald F. Sears, Olga A. Fedorova, Sergey P. Gromov, A. Braun, M. Woerner, Andrei V. Churakov, Yu. V. Fedorov, A. I. Vedernikov, L. G. Kuz'mina, Stefan H. Bossmann, Jack Saltiel, Michael V. Alfimov, Judith A. K. Howard
Publikováno v:
Journal of the American Chemical Society. 121:4992-5000
Photochromic styryl dyes containing benzodithia-18-crown-6 and N-substituted benzothiazolium moieties are synthesized and characterized spectroscopically and, for a specific case, by X-ray crystallography. The effects of the N-substituent and of sulf
Publikováno v:
Proceedings of the National Academy of Sciences. 96:4408-4413
An a priori model-independent method for the determination of accurate spectra of photocycle intermediates is developed. The method, singular value decomposition with self-modeling (SVD-SM), is tested on simulated difference spectra designed to mimic
Publikováno v:
Proceedings of the National Academy of Sciences. 96:4414-4419
Singular value decomposition with self-modeling is applied to resolve the intermediate spectra and kinetics of the Asp96 → Asn mutant bacteriorhodopsin. The search for the difference spectra of the intermediates is performed in eigenvector space on
Publikováno v:
Journal of the American Chemical Society. 119:11202-11210
Emission from cis-1-(2-anthryl)-2-phenylethene, c-APE*, in toluene is resolved into 1t-APEB* and 1c-APE* components at temperatures ranging between 4.3 and 59.3 °C. Decomposition of effective fluorescence quantum yields, φfc, into pure component fl
Publikováno v:
The Journal of Physical Chemistry A. 101:7053-7060
The quenching of trans-1-(2-anthryl)-2-phenylethene (t-APE) fluorescence by fumaronitrile (FN) was determined as a function of excitation wavelength (λexc) and temperature (5.0 ≤ T ≤ 80.0 °C). Principal component analysis with self-modeling (PC
Publikováno v:
Journal of the American Chemical Society. 118:7478-7485
Fluorescence spectra of trans-1-(2-naphthyl)-2-phenylethene (NPE) obtained at different excitation wavelengths and tri-n-butylamine (TBA) concentrations in methylcyclohexane are resolved into four distinct components by application of principal compo