Syntheses, structures and magnetic properties for transition metal coordination polymers based on polycarboxylate and isomeric terpyridyl carboxylate ligands

Abstract

Six new transition metal coordination polymers (CPs) based on polycarboxylate and isomeric terpyridyl carboxylate ligands, namely, [Co(333cptpy)2]n·2nH2O (1), [Co2(333cptpy)2(ox)(H2O)2]n (2), [Co(233cptpy)2(H2O)2]n (3), [Ni2(333cptpy)2(H1,3,5-btc)(H2O)2]n·2nH2O (4), [Ni2(233cptpy)(1,3,5-btc)(H2O)2]n·3nH2O (5), [Cu3(333cptpy)2(m-bdc)2]n(6), (H333cptpy = 4′-(3-carboxyphenyl)-3,2′:6′,3"-terpyridine, H233cptpy = 4′-(2-carboxyphenyl)-3,2′:6′,3"-terpyridine, H2ox=oxalic acid, H3(1,3,5-btc) = benzene-1,3,5-tricarboxylic acid, H2(m-bdc) = benzene-1,3-dicarboxylic acid) have been obtained. Compound 1 exhibits a 1D loop chain structure. Compound 2 displays a (3,6)-connected 3D topological network with point symbol of {4.82}2{42.811.102}. Compound 3 is also a 1D loop chain structure. Compound 4 shows a (3,6)-connected 3D network with point symbol of {4.82}2{42.812.10}. Compound 5 demonstrates a classical 3D rtl network with point symbol of {4.62}2{42.610.83}. Compound 6 presents an interesting (3,4,6)-connected net based on paddle-wheel copper(II) units with point symbol of {4.62}2{42.68.83.102}{64.82}. The magnetic properties are discussed in detail.