Zinc(II) and Cadmium(II) Complexes with 1,3,5-Benzenetricarboxylate and Imidazole-Containing Ligands: Structural Variation via Reaction Temperature and Solvent

• Published in: Crystal growth & design Vol. 13; no. 6; pp. 2312 - 2321
• Main Authors: Luo, Li, Chen, Kai, Liu, Qing, Lu, Yi, Okamura, Taka-aki, Lv, Gao-Chao, Zhao, Yue, Sun, Wei-Yin
• Format: Journal Article
• Language: English
• Published: Washington,DC American Chemical Society 05.06.2013
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Thermal expansion; thermomechanical effects and density; Thermal properties of condensed matter; Thermal properties of crystalline solids; Temperature dependence; Imidazole derivatives; Cadmium complexes; Photoluminescence; Solvothermal synthesis; Metal complex; Pillared structure; Thermal stability; Zinc; Thermal properties; Monocrystals; Imidazoles; Temperature effects; Benzene; Ligands; X-ray diffraction analysis; Carboxylates; Crystal structure
• ISSN: 1528-7483; 1528-7505
• DOI: 10.1021/cg301815w

Five new metal complexes, [Zn3(L1)2(BTC)2]·6H2O (1), [Zn3(L1)(BTC)2] (2), [Cd3(L1)(BTC)2] (3), [Cd3(L2)(BTC)2]·4H2O (4), and [Cd3(L2)(BTC)2(H2O)2] (5), have been successfully synthesized by solvothermal reactions of corresponding metal salts with 1,3,5-benzenetricarboxylic acid (H3BTC) and imidazole-containing ligands 1,3,5-tris(imidazol-1-ylmethyl)benzene (L1) and 3,3′,5,5′-tetra(imidazol-1-yl)-1,1′-biphenyl (L2). The structures of the complexes were determined by single crystal X-ray diffraction analysis. Complexes 1 and 2 obtained at different reaction temperatures show different structures: 1 is a three-dimensional (3D) net with Zn-BTC3– layers pillared by L1 ligands, while 2 has a 3D structure with a Zn-BTC3– framework and Zn-L1 chain. Complexes 2 and 3, which contain different metal centers, have similar framework structures but different coordination modes of carboxylate groups. 4 and 5 that were prepared from different solvents show different 3D structures. The thermal stability, photoluminescence, and sorption properties of the complexes were investigated.