Nano-dimensional square grid, helix chain, interpenetrated double layer, and chain of ring structures in new cobalt(II) metal-organic polymers based on 4,4′-oxybis-(benzoic acid) and 1,n-bis(imidazol-l-yl-methyl)benzene (n = 2, 3, 4)

• Published in: Journal of coordination chemistry Vol. 66; no. 5; pp. 904 - 914
• Main Authors: Huang, Bi-Feng, Xiao, Hong-Ping, Huang, Hui, Li, Xin-Hua, Wang, Jia-Guo, Morsali, Ali
• Format: Journal Article
• Language: English
• Published: Abingdon Routledge 01.03.2013; Taylor & Francis Ltd
• Subjects: 4,4′-Oxybis(benzoic acid); Chains (polymeric); Cobalt(II); Coordination polymers; Double layer; Metal-organic polymers; Nano-dimensional square grid; Nanocomposites; Nanomaterials; Nanostructure; Networks; Thermogravimetric analysis
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958972.2013.769211

Four cobalt(II) coordination polymers, [Co 2 (oba) 2 (1,2-bix) 2 ] n (1), [Co(oba)(1,3-bix)] n (2), {[Co 4 (oba) 4 (1,4-bix) 4 ]·6H 2 O} n (3), and {[Co 6 (oba) 6 (1,4-bix) 6 ]·2H 2 oba·3DMF·11H 2 O} n (4), where H 2 oba = 4,4′-oxybis(benzoic acid), DMF = N,N-Dimethyl formamide, and 1,n-bix = 1,n-bis(imidazol-l-yl-methyl)benzene (n = 2, 3, 4), have been synthesized. These compounds were structurally characterized by single-crystal X-ray crystallography, IR spectroscopy, and thermogravimetric analysis. Compound 1 exhibits a 2-D nano square grid (4,4) network, while 2 features a 2-D structure with two distinct left- and right-handed helical chains. Compound 3 possesses a doubly interpenetrated double-layered framework structure. The structure of 4 is comprised of 1-D chains of rings. The structural differences reveal that the flexible dicarboxylate and neutral bis(imidazole) are effective building blocks in constructing coordination polymers with diverse architectures.