Abstract
Abstract The g-values of ESR spectra of superoxide (O2•−) complexes with various organotin compounds acting as Lewis acids were determined in acetonitrile at 143 K. The binding energies (ΔE) in the complexes between organotins and O2•− have been evaluated from deviation of the gzz-values from the free spin value. The ΔE values are well correlated with the catalytic reactivity of organotins as well as a series of metal ions acting as Lewis acids to promote electron transfer from cobalt(II) tetraphenylporphyrin to O2, which would not occur in the absence of Lewis acids under otherwise the same experimental conditions.
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