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.

Graphical abstractEight 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 full-size imageDownload as PowerPoint slide