Metal-substituted Bacteriochlorophylls: Novel Molecular Tools
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چکیده
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Metal-Substituted Bacteriochlorophylls. 2. Changes in Redox Potentials and Electronic Transition Energies Are Dominated by Intramolecular Electrostatic Interactions
Changes in the electronic transition energies and redox potentials because of metal substitution in bacteriochlorophyll a justify the recently suggested correlation between electronegativity øM, covalent radius, and an effective charge, QM, at the metal atom center. A simple electrostatic theory in which QM modifies the energies of the frontier molecular orbitals by Coulombic interactions with ...
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I. Substrate specificity of POR Several modified Pchlid derivatives were tested for substrate activity with POR (Griffiths, 1991; Helfrich, 1995; Helfrich et al., 1996; Schoch et al., 1995; Klement et al., 1999). The central Mg can be substituted by Zn while the metal-free Pchlid and the Ni, Co, and Cu complex are inactive. Modifications of the side chains at rings A and B are throughout tolera...
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Transition-metal-substituted (TMS) polyoxometalates of the general formula [SiW9M3O39], (where M = first row transition metal), has been synthesized and supported on anatase by sol–gel method under oil-bath condition. The tetrabutylammonium (TBA) salts of the Keggin-type polyoxotungstates [SiW9M3O39], (M = VII, CrII, MnII, FeII CoII and NiII), proved to be green, reusable, and ...
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تاریخ انتشار 2007