Shicai Lin, Yingying Liu, Zhao-Xi Wang
Nov 1, 2019
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Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract 5-Bromoisophthalic acid (5-Br-H2ip) reacts with metal nitrates and dipyridyl-type auxiliary ligands to afford five coordination polymers, [Co2(5-Br-ip)2(azpy)2]n∙2nH2O (1), [Ni2(5-Br-ip)2(4,4′-bipy)2]n∙5nH2O (2), [Zn(5-Br-ip)(4,4′-bipy)]n·nH2O (3), [Zn2(5-Br-ip)(bpmba)2(H2O)2]n∙nDMF(4), [Zn2(5-Br-ip)(bpmba)2]n∙2nH2O (5) (azpy = 4,4′-azobispyridine; 4,4′-bipy = 4,4′-bipyridine; Hbpmba = 3,5-bis(pyridin-4-yl-methoxy)benzoic acid). These complexes are characterized by elemental analysis, IR, PXRD, thermogravimetry and single crystal X-ray structural analysis. Complex 1 is a 2D double-layered network constructed from [Co2(5-Br-ip)2]n double-chains pillared by azpy spacers. Complexes 2 and 3 are 2D double-layered networks using 4,4′-bipy as spacer. Complexes 4 and 5 are different 3D porous metal–organic frameworks (MOFs) assembled by 2D wave-like [Zn(bpmba)]n networks and bidentate 5-Br-ip2− linkers. Both complexes show (3,4)-connected jea-type nets of {63}{65·8} topology. The five complexes are thermally stable up to 350–410 °C. Complexes 1 and 2 show weak antiferromagnetic interactions in the carboxylate-bridged Co2(CO2)2 and Ni2(CO2)2 dimers.