Syntheses, crystal structures, and luminescent properties of two cadmium(II) complexes based on bis(imidazole) and dicarboxylate

Abstract

Two complexes, [Cd(ip–OH)(H₂biim)(H₂O)][Cd(ip–OH)(H₂biim)(H₂O)₃]·8(H₂O) (1) and [Cd(Himdc)(H₂biim)] _n (2) (H₂ip–OH = 5-hydroxylisophthalic acid, H₂biim = 2,2’-biimidazolate, H₃imdc = 4,5-imidazoledicarboxylic acid), have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. 1 is a 3-D supramolecular network constructed by 0-D and 1-D motifs through hydrogen bonds and π⋯π interactions. Complex 2 is a 1-D zigzag polymeric coordination chain and the chains are connected to form a 3-D supramolecular network by hydrogen bonds. The complexes were characterized by elemental and thermogravimetric analyses. Fluorescence was also investigated.

Keywords:

• Cadmium(II) complexes
• 2,2’-Biimidazolate
• 5-Hydroxylisophthalic acid
• Supramolecular structure
• Luminescent property

Acknowledgments

This work was supported by the NSF of China (21271038, 21071027), the China High-Tech Development 863 Program (2007AA03Z218) and analysis and testing foundation of Northeast Normal University.