Publication Date:
2014-06-06
Description:
Two three-dimensional (3D) lanthanide coordination polymers (CPs) of the general formula [ Ln 2 (PDOA) 3 (H 2 O)] n · 2 n H 2 O [ Ln = Gd ( 1 ), Tb ( 2 )] were synthesized by solvothermal reactions of the corresponding rare-earth chloride and pyrazine-2,3-dicarboxylic acid (H 2 PDOA). The CPs were structurally characterized by single-crystal X-ray diffraction, IR spectroscopy, thermogravimetry, and elemental analysis. CPs 1 and 2 are isostructural and crystallize in the monoclinic space group P 2 1 / c . The frameworks are constructed from dinuclear lanthanide building blocks in which the PDOA 2– ions adopt three coordination modes, μ 3 - k O; k O; k N,O, μ 4 - k N,O; k O; k O; k O,O, and μ 5 - k N,O; k O; k O; k O,O; k O, respectively. The Tb 3+ polymer of 2 exhibits characteristic photoluminescence in the visible region. The magnetic properties of CP 1 were investigated by measuring the magnetic susceptibilities in the temperature range 1.8–300 K.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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