Abstract

Multinuclear n.m.r. studies on transition metal carbonyl clusters are providing important information about ( a ) mechanisms of ligand inter- and intra-exchange, ( b ) metal polyhedral rearrangements, ( c ) the controlled capping of Rh 3 -triangular and Rh 4 -square faces, which often provides a convenient route for the synthesis of higher nuclearity carbonyl clusters, and ( d ) bonding within the cluster. Recent 13 C and 31 P n.m.r. measurements under high pressures of gas promise in situ mechanistic information and structural identification of intermediates present under industrially forcing conditions that are usually necessary for catalysis.

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