Programmed assembly of heteromultinuclear complexes using 4 '-diphenylphosphino-2,2 ': 6 ',2 ''-terpyridine

The complex [Ru(tpy)(1)](2+) (tpy = 2,2':6',2"-terpyridine; 1 = 4'-diphenyl phosphino-2,2':6',2"-terpyridine) was prepared and reacted with trans-[PdCl 2(NCMe)(2)] to give trans-[PdCl2{(mu-1)Ru(tpy)}(2)](4+) in high yield. With trans-[PtCl2(NCPh)(2)], {Ru(tpy)(l)](2+) reacts to yield trans-[PtCl2{(mu- 1)Ru(tpy)}(2)](4+) which isomerizes in acetone solution; equilibrium is rea ched after approximate to 10 days at room temperature with a 1:19 trans:cis -isomer ratio. The reaction of trans-[PtCl2(NCPh)(2)] with ligand 1 gives c is-[PtCl2(l)(2)l]. The single crystal structures of cis-[PtCl2(1)(2)]. H2O and cis-[PtCl2(1)(2)]. CH2Cl2. 1.6C(5)H(12) are described and significant d ifferences in structure are observed dependent upon whether the solvate mol ecules are able to enter into hydrogen bonding interactions with the comple x. (C) 2000 Elsevier Science S.A. All rights reserved.