Magnetism, electronic spectra, and structure of transition metal alkoxides. VIII. Nickel halo methoxides

Abstract

The results of magnetic and spectral measurements of Ni(OMe)Cl and its solvates are interpreted in terms of clusters of four nickel atoms interacting ferromagnetically through 90� methoxy bridges. It is proposed that these clusters associate through chlorine bridges to form an infinite lattice. Solvation by methanol breaks only chlorine bridges so that the magnetic clusters are preserved. Stepwise replacement of chlorine by methoxyl resulted in the isolation of the expected compounds of composition Ni3(OMe)4Cl2 and Ni3(OMe)5Cl. Here, the magnetic isolation of the clusters disturbed by antiferromagnetic intercluster exchange. Bromine and iodine bridges also promote antiferromagnetic exchange but in contrast to the methoxy bridges, they may be broken by solvation with methanol.