COORDINATION CHEMISTRY OF DIPHOSPHINOAMINE AND CYCLODIPHOSPHAZANE LIGANDS

The transition metal coordination and organometallic chemistry of acyc lic diphosphazane ligands has grown rapidly in the last two decades an d a stage has been reached that permits a delineation of similarities and contrasts with the chemistry of diphosphinomethane type ligands. D iphosphazane complexes of Group 10 metals (particularly those of Pd an d Pt) have received much less attention than the analogous complexes o f transition metals of other groups in the Periodic Table. The coordin ation chemistry of cyclodiphosphazanes has been investigated to a limi ted extent compared with that of their acyclic analogues. An attractiv e feature of the diphosphinoamine chemistry is the ease with which a r ange of ligands with different electronic and steric attributes can be synthesized by varying the substituents on both nitrogen and phosphor ous.