Abstract
A series of new platinum complexes of the type cis-[Pt(L) 2X] (where L=heptamethyleneimine and X=1,1-cyclobutanedicarboxylate (CBDCA), oxalate, malonate, methylmalonate, ethylmalonate, dimethylmalonate, or diethylmalonate ligand) were synthesized and characterized by elemental analysis, infrared, and 195Pt nuclear magnetic resonance spectroscopy. The crystal structure of cis-[Pt(L) 2(malonate)]·H 2O was determined by X-ray crystallography. In all of the molecules, the platinum atom adopts a distorted square-planar geometry. Two of the coordination sites of the metal center are occupied by heptamethyleneimine ligands, which are arranged in a cis orientation. The coordination sphere of the metal is completed through interaction of the platinum with two of the oxygen atoms of the malonate ligand, resulting in the formation of a six-membered chelate ring. In the solid state, an intricate network of hydrogen bonds is found to exist between carbonyl oxygen atoms, amine hydrogen atoms and included solvent water.
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