N-Methyl-substituted ethane-1,2-diamine complexes of dichlororhodium(III)
Abstract
The synthesis and spectroscopic properties of some complexes of the type trans-[RhCl2(N–N′)2]+(N–N′=N-methyl-,NN′-dimethyl-,NN-dimethyl,NNN′-trimethyl-, and NNN′N′-tetramethyl-ethane-1,2-diamine, men, sdmen, udmen, trimen, and tetmen, respectively) are described and the previously reported route to trans-[RhCl2(udmen)2]+ is shown to give a cis-isomer. The chemical and polarographic-reduction behavious of the complexes is reported together with a kinetic study of chloride–bromide exchange in trans-[RhCl2(N–N′)2]+(N–N′= men, udmen, trimen, or tetmen). The activation parameters for the reaction of trans-[RhCl2(tetmen)2]+ with bromide ion have been determined and are discussed in relation to literature data for the analogous reactions of trans-[RhCl2(en)2]+and trans-[RhCl2(NH3)4]+.