Singlet-state electron transfer between a porphyrin and ubiquinone: a transient resonance Raman and quantum chemical study

Article Abstract:

The photodynamics of a noncovalent complex of a free base meso-tetrakis (4-sulfonatophenyl)porphine (P) and 2,3-dimethoxy-5-methyl-1,4-benzoquinone (ubiquinone, UQ(sub 0)) has been studied using transient resonance Raman spectroscopy. P and UQ(sub 0) form a weak ground-state complex which decays after photoexcitation of a local porphyrin pi-pi excited state. The research focuses on rarely-observed singlet electron transfer intermediates in a system where a porphyrin donor and a ubiquinone acceptor exist in solution equilibrium in free and associated states.

Ubiquinones, Porphyrins, Charge transfer

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Relevance of the electric-dipole-electric-quadrupole contribution to Raman optical activity spectra

Article Abstract:

The contribution of the electric-dipole-electric-quadrupole polarizability tensor to the intensity theory of Raman optical activity (ROA) spectra is examined. The analysis of the ROA spectra by density functional theory shows a very small contribution of the electric-dipole-electric-quadrupole tensor, except in case involving C-H stretching vibrations.

Usage, Density functionals, Density functional theory, Carbon compounds

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Generalized two-dimensional correlation analysis of NMR and Raman spectra for structural evolution characterization of silk fibroin

Article Abstract:

Generalized two-dimensional correlation spectroscopy was used to characterize the structural evolution of silk fibroin during pH changes. It was seen that as pH changes from 6.8 to 4.8 the conformational transitions of silk are induced step by step.

Nuclear magnetic resonance, Hydrogen-ion concentration, pH measurement, Structure, Chemical properties, Globular proteins

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