ISSN 2630-0583 (Print)
ISSN 2630-0656 (Online)
Journal of Current Science and Technology
Rangsit Journal of Arts and Sciences. Vol.6 No.1 , January - June 2016.
Solvothermal synthesis, structure, and luminescent properties of a series of 3D lanthanide carbonate frameworks
A series of three-dimensional (3D) lanthanide carbonate coordination polymers [Ln(μ5-CO3)(μ2-OH)], LnIII = Pr (1Pr), Nd (2Nd), Sm (3Sm), Eu (4Eu), Gd (5Gd), Tb (6Tb) and Dy (7Dy), has been synthesized using solvothermal conditions and characterized by spectroscopic methods. Structures of compounds 1Pr-3Sm were solved from single crystal X-ray diffraction (SCXRD) data, whereas microcrystals of compounds 4Eu-7Dy were not of sufficient quality for SCXRD analysis. Therefore, conventional powder X-ray diffraction (PXRD) and elemental analysis have been used to verify the phase purity. SCXRD analysis revealed that compounds 1Pr-3Sm are isostructural and crystallize in the orthorhombic space group Pnma with four formula units per unit cell. In the crystal structure, each LnIII cation is bridged by five μ5-η2:η2:η2:η1:η1-CO32− and two μ2-OH− ligands forming a neutral 3D framework. The luminescence properties of compounds 4Eu and 6Tb were investigated in the solid state at room temperature.