Structure and characterization of novel zinc(II) and cadmium(II) complexes with 2-(benzoylamino)benzenethiolate and 1-methylimidazole. NH![](https://www.rsc.org/images/entities/char_200a.gif)
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S Hydrogen bonding in metal complexes with a S2N2 binding site
Abstract
Neutral four-co-ordinate zinc(II) and cadmium(II) complexes [M(S-2-PhCONHC6H4)2(1-MeIm)2]·0.5H2O (M = Zn 1 or Cd 2, 1-MeIm = 1-methylimidazole), were synthesized and their structures determined by X-ray crystallography. In both complexes the metal atoms have distorted tetrahedral configurations with S2N2 binding sets. The formation of a NH· · ·
S hydrogen bond in 1 and 2 was confirmed by IR spectroscopic measurements in the solid state. The solution properties of the complexes were investigated by NMR spectroscopy. In 1H NMR spectra downfield shifted signals were observed for amide NH protons of complexes 1 and 2 in acetonitrile-d3 solution. The results indicate that there are also interactions between the NH and sulfur atom in solution. Such non-covalent NH
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S interactions are considered to be important in controlling the conformation and properties of complexes with S2N2 binding sites.