(Et₄N)[Mo^III(DAPBH)Cl₂], the first pentagonal-bipyramidal Mo(<scp>iii</scp>) complex with a N₃O₂-type Schiff-base ligand: manifestation of unquenched orbital momentum and Ising-type magnetic anisotropy

Abstract

The first paramagnetic pentagonal-bipyramidal complex of Mo(iii) with a N3O2-type Schiff-base ligand was synthesized by the comproportionation reaction between Mo(ii) and Mo(iv) congeners. The complex has a low-spin (S = 1/2) ground state of MoIII(4d3) with double orbital degeneracy and unquenched orbital momentum, which result in strong Ising-type magnetic anisotropy.