New main group ligands for complexation with transition and inner transition elements

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Abstract

Symmetrical and unsymmetrical diphosphinoamines of the type X2PN(R)PX2 and X2PN(R)YY′ offer vast scope for the synthesis of a variety of transition metal organometallic complexes. Diphosphinoamines can be converted into their dioxides which are also accessible from appropriate (chloro)phosphane oxide precursors. The diphosphazane dioxides form an interesting series of complexes with lanthanide and actinide elements. Structural and spectroscopic studies have been carried out on a wide range of transition metal complexes incorporating linear P-N-P ligands and judiciously functionalized cyclophosphazanes and cyclophosphazenes.