Chemistry of polydentate ligands. Part 5. Complexes of 2,9-di-hydrazino-derivatives of 1,10-phenanthroline. Dependence of co-ordination number of a ligand on the anion present

Abstract

Two quadridentate ligands have been prepared by reaction of 2,9-dichloro-1,10-phenanthroline with hydrazine hydrate and methylhydrazine. The formation of complexes of Ag^I, Fe^II, Mn^II, Zn^II, Cd^II, Hg^II, and Ni^II with these ligands is described. Electrical conductivity, i.r., and ¹H n.m.r. spectral date of diamagnetic complexes are reported. The compound 2,9-dihydrazino-1,10-phenanthroline can also act as a tridentate ligand, as in the complex with nickel perchlorate, where the metal to ligand ratio is 1 : 2. Electronic spectral data of the nickel(II) complexes are presented. The preparation of a tridentate ligand, 2-(1-methylhydrazino)-1,10-phenanthroline, and of nickel(II) and iron(II) complexes of this ligand is also reported.