Structural and mechanistic studies of co-ordination compounds. Part 37. Ligand-substitution kinetics of some halogeno tetra-amine complexes of cobalt(III), ruthenium(II), and ruthenium(III)

Abstract

The first-order rate constants for the replacement of X^– from 21 different complexes of the type trans-[ML(A)X]ⁿ⁺[M = Co^III, Ru^III, or Ru^II; L = either two bidentate or one quadridentate amine ligand; and (A)X =(Cl)Cl, (Cl)Br, (Br)Cl, or (Br)Br] have been determined over a range of temperature. It has been found that the ruthenium(II)(d⁶) complexes behave much more like the corresponding ruthenium(III)(d⁵) than the cobalt(III)(d⁶) and rhodium(III)(d⁶) systems.