Palladium(II) and platinum(II)-C-(3)-substituted 2,2 '-bipyridines

Reaction of Pd(OAc)(2) with HL1 and HL2 (HL1=6-iso-propyl-2,2'-bipyridine; HL2=6-neo-pentyl-2,2'-bipyridine), followed by treatment with LiCl or KI gives [PdCl(L-1)](2), (1), [PdCl(L-2)](2), (2), [PdI(L-2)](2), (3), respectively. The chloride bridge in complexes 1 and 2 is split by PPh3 to give the mononuclear species PdCl(L-1)(PPh3), (4), and PdCl(L-2)(PPh3), (5). Spectroscopic data provide evidence for coordination of the deprotonated ligands through a nitrogen and the C((3)) atom of the B-substituted pyridine. An analogous platinum complex PtCl(L-3)(SMe2), (6), (HL3=6-tert-butyl-2,2'-bipyridine) was obtained from trans-PtClMe(SMe2)(2) and HL3. The crystal structures of compounds 1 and 6 have been solved by X-ray diffraction analysis.

Reaction of Pd(OAc)2 with HL I and HL 2 (HLl=6-iso-propyl-2,2"bipyridine; HL2=6-neo-pen~l-2,2 '- bipyridine), followed by treatment with LiCl or KI, gives [PdCI(Lt)]2, (1), [PdCI(L2)]2 (2), and [PdI(L2)]2 (3), respectively. The chloride bridge in complexes 1 and 2 is split by PPh 3 to give the mononuclear species PdCI(L I)(PPh3) (4) and PdCI(L')(PPh3) (5). Spectroscopic data provide evidence for coordination of the deprotonated ligands through a nitrogen and the C~3) atom of the 6-substituted pyridine. An analogous plat#ram complex PtCI(L3)(SMe2) (6) (HL3=6-tert-bu~l-2,2"bipyridine) was obtained fi'om trans-PtCIMe(SMe,)2 and HL 3. The ctystal structures of compounds 1 and 6 have been solved by X-ray diffraction analysis.