Four Three-Dimensional Coordination Polymers Constructed by 2-((1H-1,2,4-Triazol-1-yl)methyl)-1H-Imidazole-4,5-Dicarboxylate: Syntheses, Topological Structures, and Magnetic Properties

Hydrothermal reactions of Mn(II), Co(II), Cu(II), and Cd(II) salts with 24(1H-1,2,4-triazol-1-yl)methyl)-1H-imidazole4,5-dicarboxylic acid (H(3)tmidc) lead to four novel coordination polymers, namely, [Mn-3(tmidc)(2)(H2O)(4)]center dot(H2O)(6) (1), [Co-3(tmidc)(2)(H2O)(4))center dot(H2O)(4) (2), [Cu-3(tmidc)(2)(H2O)]center dot(H2O) (3), and [Cd(Htmidc)] (4). Compound 1 has a three-dimensional (3D) architecture, and the topological study shows that its framework features a 3D (3,4)-connected fsc-3,4-Pbca network with the Schlafli topological symbol of (6(3))(6(3).8(3)). Compound 2 exhibits a 3D pillared framework constructed by 4-fold one-dimensional (1D) helical chains and possesses open helical channels in the framework. Topological analysis reveals that it is a unique (3,4)-connected net with the Schlafli symbol of (4.5(2))(4.5.11(4)) which is not enumerated in RCSR andTOPOS, and has not been reported in the literature. Compound 3 features a 3D intricate framework displaying a new (3,4)-connected 4-nodal net with the Schlafli symbol of (5.7(2))(4.5.7)(5(2).7(2).8.10)(4.5.7(3).8) which has not been observed in any other coordination polymers. Topological analysis of the 3D network found in compound 4 reveals that the whole structure can be rationalized as a (4.6(5))(4.6(5)) crb topological net.