Oxidative decomposition of rhodamine B dye in the presence of V[O.sub.2.sup.+] and/or Pt(IV) under visible light irradiation: N-deethylation, chromophore cleavage, and mineralization

Article Abstract:

The visible-light-induced electron transfer and degradation of rhodamine B (RhB) is determined by using V[O.sub.2.sup.+], Pt(IV) and both of them as electron acceptors. The results have indicated that in the V[O.sub.2.sup.+] and Pt(IV) combined system V[O.sub.2.sup.+] not only oxidized RhB leading to deethylation but also oxidized the reduced Pt(II) to regenerate Pt(IV), leading to further cleavage of chromophore structure of RhB, which behaved in a different way from the separate ones.

Cyclic crudes and intermediates, Synthetic Organic Dye and Pigment Manufacturing, Organic Colorants, Organic Dyes & Pigments, Organic Dyes, Irradiation, Optical properties, Electron transport, Platinum compounds, Irradiation (Radiation exposure)

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Radical dynamics of puerarin as revealed by laser flash photolysis and spin density analysis

Article Abstract:

Laser flash photolysis and theoretical spin density analysis are used to study the radical and excited-state dynamics of puerarin. The photoexcitation of neutral puerarin in acetonitrile produces a long-lived triplet excited-state, while its phenoxyl radicals, which are insensitive to oxygen and the photoexcitation of anionic puerarin, result in formation of just the radical species.

Excited state chemistry, Photolysis

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Photooxidation of dibenzothiophene and 4,6-dimethyldibenzothiophene sensitized by N-methylquinolinium tetrafluoborate: mechanism and intermediates investigation

Article Abstract:

Photooxidation of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (DMDBT) sensitized by N-methylquinolinium tetrafluoborate was investigated in O(sub 2)-saturated acetonitrile solutions. Nearly 100% oxidation of DBT and DMDBT was observed, and the oxidized products were predominantly composed of sulfides and sulfones, which are formed via photoinduced electron transfer.

Oxidation-reduction reaction, Oxidation-reduction reactions, Thiophene

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