Abstract
The hydrothermal reactions of 1,4-H 2BDC or 1,4-H 2CDC, HBTA, with Co(NO 3) 2 · 6H 2O in basified solvent gave rise to two coordination polymers, Co 5(μ 3-OH) 2(1,4-BDC) 3(BTA) 2 ( 1), [Co(1,4-CDC) 0.5(BTA)] ( 2) (1,4-H 2BDC = 1,4-benzenedicarboxylic acid, 1,4-H 2CDC = 1,4-cyclohexanedicarboxylic acid, HBTA = benzotriazole) and characterized by elemental analysis, IR, single-crystal X-ray diffraction and variable-temperature magnetic measurements. Complex 1 crystallizes in the triclinic system, P 1 ¯ space group; the structure determination reveals that 1 has a scarcely reported 8-connected 3D self-penetrating structure based on pentanuclear cobalt clusters. Complex 2 is monoclinic system, P2 1/ c space group, and the X-ray structural analysis shows that 2 has a 3D infinite network with (4.6 4.8)(4 2.6 2.8 2) topology. Complex 1 exhibits moderately antiferromagnetic coupling, while complex 2 indicating strong spin-orbit coupling.
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