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Two distinct coordination geometries are found in the structures of Cd(S 2 COR) 2 (2,2′-bipyridine). For R = CH 2 CH 2 OCH 3  ( 1 ) a N 2 S 2  donor set defines a distorted tetrahedral geometry for cadmium as the xanthate ligands adopt a monodentate coordination mode. By contrast, a N 2 S 3  donor set is found in the structure where R is butyl ( 2 ) as one of the xanthate ligands is chelating. An analysis of the crystal structures shows that both lattices feature extensive C–H...π interactions and that in ( 1 ) there are C–H...O interactions that are not present in ( 2 ). In ( 2 ) there are π...π interactions that are absent in ( 1 ). A qualitative argument based on crystal packing considerations is proposed to explain the differences in molecular structures.

zeitschrift für kristallographie - crystalline materials

Crystal structures of 2,2′-bipyridine adducts of two cadmium  O -alkyl dithiocarbonates: rationalisation of disparate coordination geometries based on different crystal packing environments