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Issue 24, 1998

Palladium(II) and platinum(II) derivatives with N,O ligands

Abstract

The preparation of a series of Pd(II) and Pt(II) derivatives with three N,O hybrid ligands 1-(2-pyridyl)ethyldiphenylphosphine oxide, L1; (2-pyridyl)methyldiphenylphosphine oxide, L2 and 2-pyridyldiphenylphosphine oxide, L3 is described. Depending on the ligand to metal molar ratio, either 1∶1 [LMCl2] {[L1PdCl2] 1, [L2PdCl2] 2, [L3PdCl2] 3, [L1PtCl2] 4} or 2∶1 [L2MCl2] {[L12PdCl2] 5, [L22PdCl2] 6, [L12PtCl2] 7} adducts are obtained. In addition, an ionic species [L12Pd][PF6]2 8, has been isolated by treatment of complex 5 with AgPF6. The structures in the solid state of compounds 5b·MeOH·H2O, 6·MeOH and 4·CH2Cl2 have been solved by X-ray diffraction. The structures of trans-[L12PdCl2] 5b (one of the diastereomers of 5) and trans-[L22PdCl2] 6 are rather different, the former being a chiral molecule (R,R enantiomer) with a C2 axis perpendicular to the plane of the metal, the latter, 6, being a centrosymmetric molecule. In both the species the ligand is bonded through the nitrogen atom. In complex [L1PtCl2] 4, the ligand is coordinated through the N and O atoms to form a six-membered ring which adopts a boat-like conformation. The structure reveals a fairly short interaction between one hydrogen atom of the Me group in an axial position and the platinum atom, Pt  · · ·  H 2.69 Å. Short contacts Pd  · · ·  H are also observed in the structures of compounds 5b and 6. Some aspects of the reactivity of the new species are discussed.

Article information


J. Chem. Soc., Dalton Trans., 1998, 4119-4126
Article type
Paper

Palladium(II) and platinum(II) derivatives with N,O ligands

G. Minghetti, S. Stoccoro, M. Agostina Cinellu, A. Zucca, M. Manassero and M. Sansoni, J. Chem. Soc., Dalton Trans., 1998, 4119 DOI: 10.1039/A805842C

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