A New 1D Coordination Polymer of Lanthanum-Sulfate-1,10-Phenanthroline: Synthesis, Structure, and Photoluminescence Property

A 1D coordination framework, {[La-2(o-phen)(2)(SO4)(3)(H2O)(2)]}(n) (1) (o-phen = 1,10-phenanthroline) was hydrothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR, and UV-Vis spectroscopy. The crystal of 1 crystallized in the triclinic P,1. space group, a = 10.3228(5) angstrom, b = 12.3644(7) angstrom, c = 12.6579(6) angstrom, alpha = 72.323(2)degrees, beta = 75.610(2)degrees, gamma = 82.785(2)degrees, V = 1488.82(13) angstrom(3), Z = 2. The structure exhibits a neutral 1D framework representing a five-connected uninodal 1-periodic net of (3,6)(0,2) topology. The framework structure comprises TPRS-9 {LaO7N2} units, chelating o-phen ligands and bridging sulfates of 3.1110 and 4.2211 coordination modes. These 1D chains are extended into a 3D supramolecular structure by hydrogen bonding interactions of, R-2(2) (n) patterns. Thermogravimetric analysis shows the structure to be thermally stable up to approximately 400 degrees C. Photoluminescence investigations on Eu3+ and Tb3+ doped samples suggest the competition between the ligand-to-metal charge-transfer and energy-transfer processes.