Syntheses, Structures, and Properties of the 3D Lanthanide Organic Frameworks with N-Heterocyclic Polycarboxylic Acids.

Yang, Ai‐Hong; Zhao, Li‐Hua; Qi, Xue‐Jie; Lu, Yi‐Wei

Four 3D lanthanide organic frameworks from potassium pyrazine-2, 3, 5, 6-tetracarboxylate (K4pztc) or potassium pyridine-2, 3, 5, 6-tetracarboxylate (K4pdtc), namely, {[KEu(pztc)(H2O)2] ·H2O} n ( 1), {[KTb(pztc)(H2O)2] ·1.25H2O} n ( 2), {[K Ln(pdtc)(H2O)] ·H2O} n [ Ln = Gd ( 3), Ho ( 4)], were synthesized by reaction of the corresponding lanthanide oxides with K4pztc or K4pdtc in presence of HCl under hydrothermal conditions, and characterized by elemental analysis, TGA, IR and fluorescence spectroscopy as well as X-ray diffraction. In complexes 1 and 2, the dodecadentate chelator pztc4- links four LnIII ions and four KI ions. The coordination mode of the pztc4- ligand is reported for the first time herein. Complexes 3 and 4 are isostructural with earlier reported Nd, Dy, Er complexes. Moreover, the EuIII and TbIII complexes exhibit the characteristic luminescence.

RARE earth metals; POLYCARBOXYLIC acids; PYRIDINE synthesis; POTASSIUM; X-ray diffraction; FLUORESCENCE spectroscopy; INFRARED spectroscopy

Zeitschrift für Anorganische und Allgemeine Chemie, 2014, Vol 640, Issue 11, p2296

0044-2313

Academic Journal

10.1002/zaac.201400209