Coordination chemistry of diphosphinoamine and cyclodiphosphazane ligands

The transition metal coordination and organometallic chemistry of acyclic diphosphazane ligands has grown rapidly in the last two decades and a stage has been reached that permits a delineation of similarities and contrasts with the chemistry of diphosphinomethane type ligands. Diphosphazane complexes of Group 10 metals (particularly those of Pd and Pt) have received much less attention than the analogous complexes of transition metals of other groups in the Periodic Table. The coordination chemistry of cyclodiphosphazanes has been investigated to a limited extent compared with that of their acyclic analogues. An attractive feature of the diphosphinoamine chemistry is the ease with which a range of ligands with different electronic and steric attributes can be synthesized by varying the substituents on both nitrogen and phosphorous