Zinc(II) and cadmium(II) complexes with mixed 1,3-di(1H-imidazol-4-yl)benzene and cyclohexanedicarboxylate ligands: Synthesis, structure and property

Eight new coordination polymers [Zn(L)(cis-1,2-CHDA)] (1), [Zn(L)(trans-1,3-CHDA)]·2.5H2O (2), [Zn(L)(cis-1,3-CHDA)]·H2O (3), [Cd(L)(cis-1,2-CHDA)]·3H2O (4), [Cd2(L)2(cis-1,2-CHDA)2]·3H2O (5), [Cd(L)(cis-1,3-CHDA)]·H2O (6), [Cd(L)(cis-1, 4-CHDA)]·5H2O (7) and [Cd(L)(cis-1,4-CHDA)] (8) were synthesized by reactions of corresponding metal salt with 1,3-di(1H-imidazol-4-yl)benzene (L) and different carboxylic acids such as 1,2-cyclohexanedicarboxylic acid (1,2-H2CHDA), 1,3-cyclohexanedicarboxylic acid (1,3-H2CHDA) and 1,4-cyclohexanedicarboxylic acid (1,4-H2CHDA), respectively. The results of crystal structure analysis revealed that 4, 7 and 8 are chains, 1, 3, 5 and 6 are (3)-connected 2D networks with Point (Schläfli) symbol of (63), while 2 is a (3,3)-connected 2D network with Point (Schläfli) symbol of (44,62). Thermal stability and photoluminescence of the complexes were investigated. Furthermore, DFT calculations were carried out on 2–5, and 7 and 8 to discuss the temperature dependent reaction of the complexes.

Eight new coordination polymers with different cyclohexanedicarboxylate and rigid ditopic 4-imidazole-containing ligands have been obtained and found to show different structures. The results revealed that the reaction temperature has effect on the manifestation of the resulting structures.Figure optionsDownload as PowerPoint slide