Structure-forming role of heterocyclic compounds in the synthesis of metal-organic frameworks based on cadmium(II)

Resumo

The influence of heterocyclic compounds on the formation of coordination polymers in the system of cadmium(II) nitrate tetrahydrate and biphenyl-4,4′-dicarboxylic acid is demonstrated. Two new coordination polymers [Cd(H₂O)(bpdc)(im)₂] (1, bpdc^2– is biphenyl-4,4′-dicarboxylate, im is imidazole) and [(CH₃)₂NH₂]₄[Cd₆(dmf)(bpdc)₈]·10DMF (2) were obtained under solvothermal conditions in the presence of imidazole or benzimidazole, respectively. Product 1 has a chain structure, while compound 2 possesses a three-dimensional structure with the hex topology. The obtained compounds were characterized by IR spectroscopy, thermogravimetry, elemental analysis, and powder X-ray diffraction.