Hydrothermal synthesis, structure and luminescent properties of one-dimensional lanthanide benzenedicarboxylates, $M(NO_{3})M_{2}(C_{12}H_{8}N_{2})_{2}(C_{8}H_{4}O_{4})_{4}.H_{2}O$, (M = La, Pr), possessing infinite M-O-M linkages

摘要

A hydrothermal reaction of a mixture of $M(NO_{3})_{3}$, 1,2-dicyanobenzene, 1,2-benzenedicarboxylic acid (1,2-BDC), 1,10-phenanthroline and piperazine gave rise to a new compound, $[M(NO_{3})M_{2}(C_{12}H_{8}N_{2})_{2}][(C_{8}H_{4}O_{4})_{4}].H_{2}O$, (M = La, I and Pr, II). The structure is built up from the connectivity of $MO_{n}$ polyhedra by sharing an edge or face. The metal atoms are coordinated by 1,10-phenanthroline or nitrate groups along with the phthalates resulting in an infinite onedimensionalM-O-M chain. The crystal structure is stabilized by pi...pi and CH...pi interactions. Our preliminary investigations of the $Eu^{3+}/Tb^{3+}$ doped samples (in place of $La^{3+}$), indicate that interesting red/pink or green luminescence can obtained by excitation at 252 nm. The luminescence behavior probably results from the ligand-sensitized metal-centered emission.