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Redox chemistry of germanium(II) reveals that it participates in single electron transactions under stringent conditions such as the requirement of a stronger oxidant and copious amounts of halide in the reaction medium.

Research has been conducted on the tin(II), indium(I) and germanium(II). The reactions of these metals with chromium(VI) and chromium(IV) species have been investigated and the results demonstrate the evidence for the 2e (super)- changes occurred via the oxygen atom (oxo) transfer.

Water soluble derivatives of [Mn(super III)(C2O4)3](super -3), [Mn(super IV)(bigH)3](super +4)and [(bipy)(sub 2)Mn(super III)(O)(sub 2)Mn(super III)(O)(sub 2)Mn(super IV)(bipy)(sub 2)]( super +3) are reduced quantitatively to Mn(II) by the s(super 2) centers,InI, SnII, and eII. Rates are determined by the initial act of electron transfer, giving an s1 transient.

Solutions of the complexes of hypervalent manganese, [MnIII(C2O4)3]3- (in oxalate buffers), [MnIV(bigH)3]4+ (in biguanide buffers), and [(bipy)2MnIII(O)2MnIV(bipy)2]3+ (in bipyridyl buffers) may be reduced by s² center reductants In(I), Sn(II), and Ge(Il), yielding Mn(Il) quantitatively. In all cases, rates are determined by the initial act of electron transfer, giving an s¹ transient (InII, SnIII, or GeIII); subsequent steps are rapid and kinetically silent. The InI-MnIII and GeII-MnIII reactions are inhibited by added oxalate, whereas the SnII-(MnIIIMnIV) reaction is strongly accelerated by Cl-. The InI-MnIV reaction is complicated by formation of a 1:1 addition compound InI·MIV . We find no evidence for two-unit steps in any of these systems. [ABSTRACT FROM AUTHOR]

Investigates the reactions of hypervalent chromium with s[sup 2] metal-ion reducing centers. Product of the reduction of HCrO[sup 4][sup -] with excess Ge(II), In(I) and Sn(II); Intervention of Cr(IV) in the conversion process; Completion of procedure involving oxygen-atom transfer.