Ethylenediamine and propylenediamine complexes of titanium(III), vanadium(III), and chromium(III)

Abstract

Tiranium, vanadium, and chromium trichlorides react with ethylenediamine (en) and propylenediamine (pn) to yield paramagnetic complexes of the type M en₃Cl₃ and M pn₃Cl₃, those in each group being isomorphous with one another. Conductance and infrared studies indicate that all the chlorine atoms are ionic, and hence that the complexes contain tris-bidentate cations. The electronic spectra are discussed and assignments for the ligand-field bands given. The ligand-field strength of propylenediamine is virtually identical with that of ethylenediamine. The magnetic moments and infrared spectra (4000–200 cm.^–1) have been recorded and are discussed as well as the e.s.r. spectra of the titanium derivatives.