PLATINUM(II) AND PALLADIUM(II) COMPLEXES OF TETRAKIS(PYRAZOLYL)CYCLOTRIPHOSPHAZENES

Reactions of tetrakis(pyrazolyl)cyclotriphosphazene derivatives, gem-N -3-P(3)Ph(2)Pz(4) (2) and gem-N(3)P(3)Ph(2)(dmpz)(4) (4), 2ith PdCl2(P hCN)(2) or PtCl2(PhCN)(2) afforded complexes of the type MCl(2)L (L = 2 or 4). The detailed spectroscopic (proton, C-13 and P-31 NMR) invest igations revealed that in these complexes the phosphazenes act as bide ntate N-2-donor ligands via the two geminal pyrazolyl pyridinic nitrog en atoms, thus forming six-membered chelate rings. The platinum deriva tive N(3)P(3)Ph(2)Pz(4) . PtCl2 (6) reacted further with CuCl2 to yiel d a new heterobimetallic derivative, N(3)P(3)Ph(2)Pz(4) . PtCl2 . CuCl 2 (9). The EPR spectra of 9 indicated a distorted five-coordinate geom etry around copper. The electrochemistry of 9 is also reported. Copyri ght (C) 1997 Elsevier Science Ltd.