Organometallics of diphosphazanes. Part 10. Dinuclear group 6 metal carbonyl complexes bridged by a cyclodiphosphazane in its cis or trans form

Abstract

Mononuclear Group 6 metal tetracarbonyl complexes containing a Cyclodiphosphazane ligand, [PhNP(OC₆H₄Me-p)]₂(L), have been used as synthons to prepare homo- and hetero-bimetallic complexes in which the cyclodiphosphazane bridges the two metal centres in its cis or trans isomeric forms. The dimolybdenum complex [Mo₂(η⁵-C₅H₅)₂(CO)₄(µ-L)] has also been synthesized. The trends in ³¹P NMR chemical shifts and the structural features as revealed by X-ray crystallography are discussed.