TELLURO-BRIDGED AND SELENO-BRIDGED TI(IV)-M(II) (M=NI, PD, PT) HETEROBIMETALLIC COMPLEXES

Heterobimetallic complexes of the types [Cp(2)Ti(mu-EAr)(2)-M(dppe)](C lO4)(2) [(1)-(4); M, E = Ni, Te (1); Ni, Se (2); Pt, Te (3); Pt, Se (4 ); Ar = Ph (a), C6H4-4-Me (b), C6H4-4-OMe (c), C6H4-4-OEt (d)] and [Cp (2)Ti(mu-TeAr)(2)-MCl(2)] [M = Pd (5), Pt (6)] were obtained by the re actions of Cp(2)Ti(EAr)(2) with M(dppe)(ClO4)(2) and M(PhCN)(2)Cl-2, r espectively. While (1), (5) and (6) are stable in the solid state as w ell as in solution, (2)-(4) undergo dissociation to M(dppe)(EAr)(2) an d Cp(2)Ti(ClO4)(2) in solution, as shown by multinuclear (P-31{H-1}, P t-195{H-1}, Te-125{H-1}) n.m.r. studies. The reaction of Cp(2)Ti(SeAr) (2) with M(PhCN)(2)Cl-2, however, leads to the formation of Cp(2)TiCl( 2) and a polymeric material [M(SeAr)(2)](n).