Synthesis and characterisation of ring-coupled cyclopentadienyl and indenyl bimetallic derivatives of nickel

The reaction of NiCl2(PPh3)(2) with 0.5 equivalents of the salts Li-2[CMe2( C5H4)(2)] (1), Li-2[CMe2(C9H6)(2)] (2) or Li-2[(C5H4)CMe2(C9H6)] (3) is an efficient route to the synthesis of ring-coupled cyclopentadienyl and inden yl homobimetallic nickel derivatives. The new binuclear complexes [Cl(PPh3) Ni{mu-(eta -C5H4)CMe2(eta -C5H4)}Ni(PPh3)Cl] (4), [(PPh3)(2)Ni{mu-(eta -C5H 4)- CMe2(eta -C5H4)}Ni(PPh3)(2)][PF6](2) (5), [(PPh3)2Ni{mu-(eta -C9H6)CMe2 (eta -C9H6)}Ni(PPh3)(2)][PF6](2) (6), [Cl(PPh3)Ni{mu-(eta -C5H4)CMe2- (eta -C9H6)}Ni(PPh3)Cl] (7), [(PPh3)(2)Ni{mu-(eta -C5H4)CMe2(eta -C9H6)}Ni(PPh3) Cl][PF6] (8), [(PPh3)(2)Ni{mu-(eta -C5H4)CMe2(eta -C9H6)}Ni(PPh3)(2)][PF6]( 2) (9) have been prepared and characterised. The X-ray crystal structure of 5 is reported. (C) 2001 Elsevier Science B.V. All rights reserved.