ChemInform Abstract: A Novel Tetrarhodium Cluster: A Face-to-Face Carbonyl-Bridged Dimer of a Dirhodium Macrocyclic Hexaamine.

ChemInform Abstract

The new Rh cluster (III) is prepared by the reaction of the hexaamine ligand(I) with the dimer(II) and is characterized by IR and ¹³C NMR spectroscopy and an X-ray structure analysis (space group I2/m, Z=2). This compound is a metal cluster of a new kind, a face to face dimer with each rhodium of the macrocycle bridged to a rhodium of the opposite face by three carbonyl ligands. The structure iscompared to that of a related dirhodium complex of a ligand with -CH2CH2-O-CH2-CH^2- chains in place of the -(CH2)^5- chains and a mechanism is suggested to explain the resulting structural differences observed for the two complexes.