Abstract
The zinc(II) complexes 1aZnCl 2 and 1bZnCl 2 ( 1a: 2-(6 ′,2″-bipyrid-2 ′-yl)-3-(2-pyridyl)pyrazine; 1b: 2-(6 ′,2 ′-bipyrid-2 ′-yl)-5,6-dinitrilo-3-(2-pyridyl)pyrazine) were prepared by treatment of the ligands with ZnCl 2. The structures of both were investigated by X-ray crystallography and 1H NMR spectroscopy. Both complexes display proton deshielding phenomena that are attributed to a twisted solution-state molecular conformation. In the solid state, 1aZnCl 2 exhibits a high degree of torsion about the axis through the uncomplexed pyridine ring and the pendant chlorine atoms. The solid-state structure and solution-state self-associative behavior of 1bZnCl 2 are indicative of a partial self-assembly motif.
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