Abstract
The validity of the Noyes geminate-pair scavenging mechanism for the photoredox reactivity of chlorocopper (II) complexes in acetonitrile in presence of methanol, isopropanol, acetone and benzene as scavengers for chloride radicals has been tested. Experimentally obtained linear dependence of Cu(l) quantum yield formation on the square root of scavenger concentration within the range where scavenging reaction competes with the secondary recombination justifies that the Noyes mechanism is operative. The estimated values for scavenging rate constants are in good agreement with those previously reported using another experimental method. It has been found that the photoredox reactivity of the lowest spin-allowed doublet LMCT excited state of the tetrachlorocuprate (II) complex at 460 nm is higher than that of LMCT lying at 313 nm.
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