Abstract
The effect of bridging and non-bridging ligands on electron-transfer reactions in aqueous solution is considered in the light of results obtained for the reactions of Cr2+ with monohalogenochromium(III) complexes CrX2+† (where X is non-bridging), and the reactions of Eu2+ with CrX2+ (where X is probably a bridging ligand). The surprisingly large (ca 104) effect which non-bridging ligands have in the former reactions, I− > Br− > Cl− > F−, is comparable to the effect which bridging halide ions are known to have in the Cr2+-CrX2+ and Cr2+-Cr(NH3)5X2+ reactions. Factors which are believed to be important in determining the effectiveness of bridging and non-bridging ligands are discussed.
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