Crystal structure of catena-(acetato-O,O′)(bromo)- [μ-1,1′-(1,4-butanediyl)bis(benzimidazole)-N:N′]cadmium(II), CdBr(C2H3O2)(C18H18N2)

Abstract

Source of materialAm ixture of 1,1'-(1,4-butanediyl)bis(benzimidazole) (0.1 mmol), CdBr 2 × 4H 2 O(0.1 mmol) and acetic acid (0.1 mmol) in distilled water (15 mL)was placed in aTeflon-lined stainless steel vessel, heated to 120°C for 3days, and then cooled to room temperature over 24 h. Colorless block-shaped crystals of the title complex were obtained. DiscussionIn recent years, there has been great interest in the construction of metal-organic frameworks (MOFs) due to their interesting magnetic, electronic, nonlinear optical properties and intriguing structural motifs varying from extended coordination polymers to discrete molecularentities such as cagesormetallomacrocycles [1][2][3][4][5][6]. Among the distinct factors involved in the syntheses of complexes, ligand design is often auseful way of manipulating the overall resulting frameworks. In particular, the uses of flexible ligands have attracted remarkable attention because their conformationsare expected to produce many intriguing architectures. Bis(imidazole) ligands are excellent candidates for the construction of extended architectures and supramolecular architectures [7][8][9][10]. 1,1'-(1,4-butanediyl)bis(benzimidazole) (bbim), bearing alonger methylene (-CH 2 -) 4 skeleton, is agood candidate for N-donor linkers. To further understand the coordination chemistry of nonrigid long-chain linear spacers, we here report on anew complex with the flexible ligand bbim. In the title crystal structure, the asymmetric unit consists of one Cd 2+ ion, one 1,1