Synthesis, structure and sorption property of metal complexes with mixed multicarboxylate and imidazole-containing ligands

• Zn(II) and Ni(II) frameworks with mixed organic ligands have been obtained.
• The frameworks show different 2D network and 3D structures.
• Sorption properties of the frameworks were investigated.

Zinc(II) and nickel(II) frameworks [Zn2(L)(BTC)(NO3)]·H2O·2CH3CN (1), [Ni2(L)(H2O)3(HBTC)2]·3.6H2O (2), [Ni(L)(H2O)2](BPDC)·2H2O (3), [Ni(L)(H2O)(BPDC)]·4H2O (4) and [Ni2(L)(MeOH)4(BPDC)2]·2H2O (5) were synthesized by reactions of corresponding metal salts with 3,3′,5,5′-tetra(1H-imidazol-1-yl)-1,1′-biphenyl (L) and multicarboxylic acids of 1,3,5-benzenetricarboxylic acid (H3BTC), 4,4′-biphenyldicarboxylic acid (H2BPDC). Complex 1 is a 2-fold interpenetrating 3D net, while 2 is a 2D network with infinite 1D hinged Ni(II)-L chains linked by HBTC2− ligands. 3, 4 and 5 were obtained by using different molar ratios of L, H2BPDC and Ni(II) salt, and found to show different 2D network structures in which the numbers of coordinated carboxylate groups of BPDC2− are 0, 1 and 2, respectively. Sorption properties of 1–5 were investigated.

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