Acta Cryst. (2004). E60, m1147-m1150  [ doi:10.1107/S1600536804017295 ]

A chiral facially coordinated Cu^II complex derived from a tridentate bis(benzimidazole) ligand: bis[(S,S)-1,2-dimethoxy-1,2-bis(1-methylbenzimidazol-2-yl)ethane]copper(II) bis(tetrafluoroborate) acetonitrile disolvate

R. T. Stibrany, H. J. Schugar and J. A. Potenza

Abstract: Crystals of the chiral title salt, [Cu(C₂₀H₂₂N₄O₂)₂](BF₄)₂·2C₂H₃N, contain Cu(L2)₂²⁺ cations separated by disordered tetrafluoroborate anions and by acetonitrile solvent molecules. The ligands L2, (S,S)-1,2-dimethoxy-1,2-bis(1-methylbenzimidazol-2-yl)ethane, coordinate Cu ions facially to yield a distorted and tetragonally elongated octahedral coordination geometry. Coordination affords V- or butterfly-shaped ligands, cations with the overall shape of the letter X, and seven-membered chelate rings which adopt distorted boat conformations. In the crystal structure, the cations form layers parallel to (001), interspersed with layers containing both tetrafluoroborate anions and acetonitrile molecules. Ligands within a given cation, anions and solvate molecules, and cations and anions, are linked by an extensive C-HO and C-HF hydrogen-bonding network. Additionally, cations within a given layer are linked by interionic head-to-tail - interactions between two benzimidalole fragments along the a cell direction and by edge-over-edge C-H overlap between the remaining two benzimidazole fragments along the b cell direction.

Online 24 July 2004

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