Synthesis, crystal structures and photoluminescent properties of two Cd(II)/Zn(II) coordination polymers with rarely 8-/2-fold interpenetrated based on 4,4′-stilbenedicarboxylic acid and imidazole ligands

Abstract

Two coordination polymers, [Cd(sbdc)(bmib)]_n (1) and {[Zn(sbdc)(tib)]·0.5H₂O}_n (2) (H₂sbdc = 4,4′-stilbenedicarboxylic, bmib = 1,4-bis(2-methylimidazol-1-yl)butane, tib = 1,3,5-tris(1-imidazolyl)benzene), have been synthesized under solvothermal conditions, characterized by elemental analysis, infrared spectra, thermogravimetric analysis, and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that 1 and 2 show 8-fold and 2-fold interpenetrating 3-D frameworks, respectively. Complexes 1 and 2 display a 4-connected (6⁶) sqc6 and a 4-connected (4⁴·6²) sql topology, respectively. Photoluminescent and thermal properties of 1 and 2 have also been investigated.

Keywords:

• Crystal structure
• cadmium(II)
• zinc(II)
• interpenetrating construction
• photoluminescent

Acknowledgements

This research was supported by the National Natural Science Foundation of China to C.F. Bi (No. 21371161 and No. 21071134), the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20120132110015), and the Natural Science Foundation of Shandong Province to X. Zhang (No. ZR2012BQ026).

Disclosure statement

No potential conflict of interest was reported by the authors.