Topological study of diverse hydrogen-bonded patterns found in a system of a nickel(II) complex and the sulfate anion

Abstract

A nickel(II) coordination complex, bis[2,6-bis(1H-benzimidazol-2-yl-κN)pyridine-κN]nickel(II) sulfate, [Ni(CHN)]SO or [Ni(HL)]SO, 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 P222, 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.

Bis[2,6-bis(benzimidazol-2-yl)pyridine-κ3 N,N′,N′′]nickel(II) bis(trifluoromethanesulfonate) diethyl ether monosolvate

“…The nickel(II) ion shows a distorted octahedral coordination environment defined by two bbp ligands, with two trifluoromethanesulfonate ions and a diethyl ether molecule in the outer coordination sphere. All the Ni-N bond lengths are in good agreement with comparable nickel(II) bbp complexes currently available in the Cambridge Structural Database (CSD, version 5.45, Nov 2023; Groom et al, 2016;refcodes BEQTAV;Harvey et al, 2018;DURWUJ;Huang et al, 2010;MUNDAD;Ivanova et al, 2020;ZOTVIP;Wei et al, 2015;KUPFUZ;Icsel et al, 2020b), The N-Ni-N angles also concur with the values reported in the previously referenced nickel(II) bbp complexes. All relevant bonds and angles are presented in Table 1.…”