A novel three dimensional samarium(III) coordination polymer with an unprecedented coordination mode of the 2,5-pyridinedicarboxylic acid ligand: Hydrothermal synthesis, crystal structure and luminescence property

A novel three dimensional (3D) coordination polymer [Sm(pic)(2)(pydc)(4)(H2O)](n) (pydc = pyridine-2,5-dicarboxylate, Hpic = picolinic acid) (1) has been synthesized hydrothermally and characterized by elemental analysis, FT-IR, TG/DTA, single-crystal X-ray diffraction analysis and powder X-ray diffraction (PXRD). This compound crystallizes in the monoclinic space group P2(1/c) with cell parameters a = 9.3041(13)angstrom, b= 14.216(2)angstrom, c = 10.5401(15) angstrom, V= 1387.72(30) angstrom(3) and Z = 4. complex 1 has a distinct 3D open-framework architecture due to the presence of pitolinic ligands, which are converted from 2,5-pydc ligands by in-situ decarboxylation under the hydrothermal conditions. The compound exhibits strong luminescent emissions because of the f-f transitions of the Sm(III) ion at room temperature. According to TGA/DTA analysis, the coordination polymer is thermally stable up to similar to 300 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.