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The sterically crowded four-coordinate copper(I) complex rac-bis­[2,2′-bis(1-ethyl-1H-benzimidazol-2-yl)­bi­phenyl]copper(I) tri­fluoro­methane­sulfonate toluene solvate dihydrate

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The title salt, rac-[Cu(C30H26N4)2](CF3SO3)·C7H8·2H2O, contains Cu(L1)2+ cations, where L1 is 2,2′-bis(1-ethyl­benzimidazol-2-yl)­bi­phenyl, separated by tri­fluoro­methane­sulfonate anions, toluene solvent mol­ecules and two water mol­ecules of hydration, only one of which could be defined crystallographically. Chemical and crystallographic evidence are consistent with a second, highly disordered water mol­ecule in the asymmetric unit located in voids of 111 Å3. The ligands L1 form two nine-membered chelate rings with the CuI ion, resulting in a Cu[N(imine)]4 coordination geometry which is best described as distorted 222 (D2). Cu—N bond distances in the coordination sphere are long compared with those in other four-coordinate copper(I) structures containing benz­imidazole ligands, possibly owing to the steric bulk associated with the ligands L1. Within each cation, the eight ring systems, consisting of four benz­imidazole and four benzene fragments, are linked together by weak C—H… and C—H…N interactions, suggesting that the cations are relatively tightly constrained sterically. The structure, when viewed along the b direction, may be described as a criss-crossed array of alternating cation/toluene and anion/water columns along the b direction arranged parallel to the (102) and (10 ) planes.
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Document Type: Research Article

Publication date: December 1, 2004

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