Data di Pubblicazione:
2011
Abstract:
In methanol/water, dppho bleaching (519 nm) by quercetin, QH2, exhibits biphasic kinetics. The dppho reacts completely with the quercetin anion
within 100 ms. Subsequent slower bleaching involves solvent and QH2 addition to quinoid products. The fast reaction is first-order in dppho but
only ca. 0.38 order in [QH2]. This extraordinary nonintegral order is attributed to reversible formation of ?-stacked {QH-/dppho} complexes in
which electron transfer to products, {QHo/dpph-}, is slow (kET ? 10^5 s^-1).
within 100 ms. Subsequent slower bleaching involves solvent and QH2 addition to quinoid products. The fast reaction is first-order in dppho but
only ca. 0.38 order in [QH2]. This extraordinary nonintegral order is attributed to reversible formation of ?-stacked {QH-/dppho} complexes in
which electron transfer to products, {QHo/dpph-}, is slow (kET ? 10^5 s^-1).
Tipologia CRIS:
01.01 Articolo in rivista
Elenco autori:
Daquino, Carmelo; Foti, MARIO CONCETTO
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