Hydrothermal syntheses, structures, and properties of the first examples of lanthanide 4-(4,5-diphenyl-1H-imidazol-2-yl)benzote complexes

Abstract

Three new lanthanide coordination polymers with 4-(4,5-diphenyl-1H-imidazol-2-yl)benzoic acid (H₂PA), [Ln(HPA)₃(H₂O)₂]·2H₂O [Ln = Pr (1); Eu (2); Er (3)] were obtained by hydrothermal syntheses and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, and powder X-ray diffraction. Complexes 1–3 are isomorphous 2-D supramolecular structures, in which lanthanide ions are bridged by carboxyl groups of HPA⁻ to form 1-D chain structures, and the chains are further linked to 2-D supramolecular structures by hydrogen bonds. HPA⁻ exhibit chelating and μ₂-bridging coordination mode. The thermogravimetric analysis of 2 was carried out to examine the thermal stability and the photoluminescence of 2 was investigated.

Keywords:

• 4-(4,5-Diphenyl-1H-imidazol-2-yl)benzoic acid
• Lanthanide complexes
• Supramolecular network
• Hydrothermal synthesis
• Photoluminescence

Supplementary material

Figures of the IR spectra for 1–3 and the TGA curve of 2. The crystallographic data for the structures have been deposited with the Cambridge Crystallographic Data Center, CCDC Nos. 902932–902934 for 1–3. Copies of the data can be obtained free of charge on application to The Director, CCDC, 12 Union Road, Cambridge CB2 1EZ, UK (Fax: [phone]; E-mail: [email protected] or www: http://www.ccdc.cam.ac.uk).

Acknowledgments

Financial support from the National Natural Science Foundation of China (Grant No. 21264011 and No. 20961007), the Bureau of Education of Jiangxi Province (Grant No. GJJ09064) and the State Key Laboratory of Food Science and Technology of Nanchang University (No. SKLF-TS-200915) are gratefully acknowledged.