Coordination of donor-functionalized cyclopentadienyl ligands at platinum(II) centers: Syntheses and molecular structure of [mu-(1,2-eta(2): 5,6-eta(2)-cod){(eta(5)-C5Me4CH2CH2NMe2)MePt}(2)]

The syntheses of novel monomeric and dimeric platinum(II) complexes are rep orted. Modified cyclopentadienyls (Cp-R) such as pentamethylcyclopentadieny l (Cp*) and its functionalized derivatives 1-[2-(dimethylamino)eth-1-yl]-2, 3,4,5-tetramethylcyclopentadienyl (Cp*(N)), 1-(but-3-en-1-yl)-2,3,4,5-tetra methylcyclopentadienyl (Cp*(2=)) and 1-(pent-4-en-1-yl)-2,3,4,5-tetramethyl cyclopentadienyl (Cp*(3=)) were reacted with [(eta (4)-cod)PtMeX] (COD = ci s,cis-1,5-cyclooctadiene, X = halogen) to give the monomeric species [(1,2- eta (2):5,6-cod)(eta (5)-Cp-R)MePt] (Cp-R = Cp* (1), Cp*(N) (3), Cp*(2=) (5 ), Cp*(3=) (6)), wherein the COD ligand is eta (2)-coordinated to one metal center. Dimerization of 1 or 3 resulted in the COD-bridged species [mu-(1, 2-eta (2):5,6-eta (2)-cod){(eta (5)-Cp-R)MePt}(2)] (2, 4); the molecular st ructure of 4 was determined by single-crystal X-ray diffraction. All new co mpounds were characterized by H-1, C-13, and Pt-195 NMR spectroscopy and by elemental analysis where possible.