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In the title compound, [MnCl2(C12H8N2)2], the MnII complex displays a distorted octahedral coordination geometry formed by two phenanthroline ligands and two Cl anions. The crystal structure is different from that reported previously for the same compound [McCann, McCann, Casey, Jackman, Devereux & McKee (1998). Inorg. Chim. Acta, 279, 24–29].

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The title compound, [NiII(H2O)6][NiII(C4H4O4S)2]·4H2O, consists of [NiII(H2O)6]2+ complex dications, [NiII(C4H4O4S)2]2− complex dianions and non-coordinated water mol­ecules. In the complex dianion, two thio­diacetate dianions coordinate to the NiII ion in a fac-SO2-tridentate chelating mode, resulting in a distorted octa­hedral trans-NiO4S2 coordination geometry. The crystal structure is stabilized by an extensive O—H...O hydrogen-bonding network.

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The title complex, [Ni(C4H4O4S)(C3H4N2)3]·H2O, displays a distorted octa­hedral NiN3O2S coordination geometry, formed by three imidazole (imid) ligands and one thio­diacetate dianion. The NiII atom is displaced from one of the imid planes, and the angle between the corresponding Ni—N bond and the imid plane is 21.94 (19)°. This spatial orientation is stabilized by an inter­molecular C—H...π inter­action between one imid ligand and the C—H bond of an adjacent imid ligand.

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In the title complex, [Cd(C4H4O4S)(C7H6N2)3]·2H2O, the CdII atom is surrounded by three benzimidazole ligands and one thio­diacetate dianion to complete a distorted octa­hedral CdN3O2S coordination geometry. The tridentate TDA chelates to the CdII atom in a facial mode. A C—H...π inter­action and hydrogen bonding between neighboring complexes help to stabilize the crystal structure.

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In the title compound, [Co(C8H4O4)(C7H6N2)2]n, the terephthalate dianions bridge CoII ions through terminal carboxyl groups to form polymeric complex chains; one carboxyl group coordinates in a monodentate manner and the other chelates to the Co atom. Two benzimidazole ligands also coordinate to the Co atom to complete a distorted trigonal–bipyramidal coordination geometry. The crystal packing is stabilized by N—H...O hydrogen bonds and π–π stacking involving the benzimidazole ligands, with a face-to-face separation of 3.454 (11) Å.

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In the title compound, [Co(C7H5O3)2(C7H6N2)2]·0.25H2O, the CoII atom is coordinated by two 4-hydroxy­benzoate (hbz) anions and two benzimidazole (bzim) ligands in a distorted trigonal–bipyramidal geometry. The carboxylate group of one of the hbz anions chelates to the Co atom with a normal Co—O bond [1.993 (2) Å] and a longer Co—O bond [2.561 (3) Å]. Aromatic π–π stacking is observed between neighbouring bzim ligands but not between hbz ligands.

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In the title complex, [Cd(C4H4O4S)(C3H4N2)(H2O)]n, the CdII atom is surrounded by one imidazole ligand, one water mol­ecule and two thio­diacetate dianions in a distorted octa­hedral CdNO4S coordination. Each thio­diacetate dianion coordinates to two independent Cd atoms, one as a tridentate chelate, the other in a monodentate fashion through a carboxyl­ate O atom. The thio­diacetate dianions bridge neighbouring CdII atoms, forming zigzag polymeric chains.

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In the title compound, C7H7N2+·C8H4NO6, the partially overlapped arrangement and the shorter face-to-face distance of 3.457 (4) Å indicate π–π stacking between parallel benzimidazolium cations, whereas the longer face-to-face distance of 3.649 (6) Å suggests normal van der Waals contacts between parallel benzene rings of neighbouring nitro­terephthalate anions.
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