Bis(μ-1H-benzimidazole-5,6-dicarboxylato)bis[tetraaquadicobalt(II)] pentahydrate

Abstract

Key indicators: single-crystal X-ray study; T = 200 K; mean (C-C) = 0.004 Å; Hatom completeness 97%; disorder in solvent or counterion; R factor = 0.040; wR factor = 0.103; data-to-parameter ratio = 12.7.The title compound, [Co 2 (C 9 H 4 N 2 O 4 ) 2 (H 2 O) 8 ]Á5H 2 O, contains two Co II ions that are bridged by two 1H-benzimidazole-5,6dicarboxylate ligands to form an M 2 L 2 type complex (M = metal and L = ligand). There are two crystallographically distinct M 2 L 2 units, each on an inversion centre, along with coordinated and uncoordinated water molecules, in the asymmetric unit. The Co II ions are octahedral. Extensive hydrogen bonding exists between the complex and water molecules, and this helps to stabilize the crystal structure. One water molecule is disordered over two sites with occupancies 0.84:0.16. Related literatureMetal-organic coordination polymers using 1H-benzimidazole-5-carboxylic acid as a bridging ligand were reported by Guo et al. (2006) and Liu et al. (2005). ExperimentalCrystal data [Co 2 (C 9 H 4 N 2 O 4 ) 2 (H 2 O) 8 ]Á5H 2 O M r = 760.35 Monoclinic, P2 1 =c a = 13.4210 (2) Å b = 9.1096 (2) Å c = 23.8185 (4) Å = 99.5191 (6) V = 2871.95 (9) Å 3 Z = 4 Mo K radiation = 1.25 mm À1 T = 200 (2) K 0.30 Â 0.18 Â 0.08 mm Data collection Nonius KappaCCD diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 2003) T min = 0.776, T max = 0.905 22168 measured reflections 5249 independent reflections 4216 reflections with I > 2(I) R int = 0.032

A New 3D Supramolecular Manganese(II) Complex Constructed from Benzimidazole‐5,6‐dicarboxylate and Oxalate: Synthesis, Structural, and Magnetic Properties

“…In the crystal structure, the bidc 2– ligand acts as a μ 2 ‐bridge and connects two Mn II ions through one oxygen atom of the monodentate carboxylate group and one nitrogen atom of the benzimidazole ring. This coordination mode of the bidc 2– ligand has just been reported for cobalt complexes 9. Oxalate as bis(bidentate) ligand links the atoms Mn1 and Mn1A (symmetry code: A: – x +1, – y +1, – z ) by its oxygen atoms to form a dinuclear unit.…”

Poly[(μ-1H-benzimidazole-5,6-dicarboxylato)lead(II)]

“…1H-benzimidazole-5,6-dicarboxylic acid possesses two nitrogen atoms of imidazole ring and four oxygen atoms of carboxylate groups, and might be used as versatile linker in constructing coordination polymers with abundant hydrogen bonds. Several coordination polymers fomed by this ligand have been reported recently: Gao et al 2008; Lo et al (2007); Wang et al (2009); Wei et al (2008); Yao et al (2008); Zhai (2009). Herein we report the synthesis and crystal structure of the title complex of (C 9 H 4 N 2 O 4 Pb) n, Fig.…”

“…For applications of metal-organic frameworks, see: Li et al (2007). For related structures, see: Gao et al (2008); Lo et al. (2007); Wang et al (2009); Wei et al (2008); Yao et al (2008); Zhai (2009).…”

catena-Poly[[di-μ-aqua-bis[aquacobalt(II)]]-bis(μ3-1H-benzimidazole-5,6-dicarboxylato]

“…The assembly mode of coordination compounds is however strongly dependent on reaction conditions (pH, solvent, temperature, pressure, auxiliary ligands). Recently, Lo et al (2007) reported the crystal structure of a dinuclear Co (II) compound obtained in the reaction of Co(NO 3 ) 2 .6H 2 O and the multidentate ligand, 1H-benzimidazole-4,5-dicarboxylic acid (H 3 BIDC) in aqueous solution. However, when we applied hydrothermal method using the same substrates for the synthesis, a new compound, the title metal-organic polymer, was obtained (see Scheme).…”