Bis-(diisopropoxyphosphinyl)-methane complexes with rare-earth nitrates and chlorides

Abstract

Solid adducts of rare-earth nitrates or chlorides and bis-(diisopropoxyphosphinyl)-methane were prepared and characterized by chemical and spectroscopic methods. A structural change observed for the nitrate adducts in traversing the lanthanide series is considered to be a shift from monomeric to dimeric form, caused by increasing steric repulsion between the bulky isopropyl groups as the metal ion becomes smaller. It is postulated that the ratio of unidentate to bidentate bonding of the nitrate groups also varies.