Can octahedral t2g6
complexes substitute associatively? The case of the isoelectronic Ruthenium(II) and Rhodium(III) hexaaquaions
The hexaaquaions of Rh(III) and Ru(II) seem to undergo water exchange via disparate mechanisms in spite of being isoelectronic in nature. The possibility for a t2g6 ion to undergo ligand substitution reaction via an Ia mechanism definitely complicates simple rules for mechanistic interpretation and supports critics who disfavor broad application of δV≠ data to mechanistic interpretation.