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Journal Article
Research Support, Non-U.S. Gov't
Topological study of diverse hydrogen-bonded patterns found in a system of a nickel(II) complex and the sulfate anion.
A nickel(II) coordination complex, bis[2,6-bis(1H-benzimidazol-2-yl-κN3 )pyridine-κN]nickel(II) sulfate, [Ni(C19 H13 N5 )2 ]SO4 or [Ni(H2 L)2 ]SO4 , having four peripheral tetrahedrally oriented N-H donor units, combines with sulfate bridges to create hydrogen-bonded structures of varied dimensionality. The three crystal structures reported herein in the space groups P21 21 21 , I-4 and Pccn are defined solely by strong charge-assisted N-H...O hydrogen bonds and contain disordered guests (water and dimethylformamide) that vary in size, shape and degree of hydrophilicity. Two of the compounds are channelled solids with three-dimensional structures, while the third is one-dimensional in nature. In spite of their differences, all three present a striking resemblance to the previously reported anhydrous relative [Guo et al. (2011). Chin. J. Inorg. Chem. 27, 1517-1520], which is considered as the reference framework from which all three title compounds are derived. The hydrogen-bonded frameworks are described and compared using crystallographic and topological approaches.
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