Orbital splittings of some tetragonal nickel(II) complexes with heterocyclic amine ligands
Electronic spectra (5000–20,000 cm.–1) are reported for some complexes of the types NiL4X2 and polymeric NiL2X2(where L = pyridine, isoquinoline, and 3- and 4-methylpyridine; X = Cl, Br, or I) at room temperature and, in some cases, at ca. 80°K. The bands due to the transitions 3A2g→3T2g and 3A2g→3T1g(F) in Oh symmetry are split. From the observed band splittings the relative d-orbital energies are deduced by use of electrostatic and molecular orbital models.