Syntheses, Crystal Structures and Properties of Two Lanthanide Selenite-carboxylate Compounds

摘要

Two lanthanide selenite-carboxylate (LSC) compounds, namely, [Ln8(SeO3)4(2,6- pdc)8(H2O)10]·2H2O (Ln = Pr 1, Sm 2; 2,6-pdcH2 = pyridine-2,6-dicarboxylic acid) have been hydro- thermally synthesized and structurally characterized. Both compounds possess two-dimensional layer structures constructed by Ln8(SeO3)4(2,6-pdc)8(H2O)10 clusters connected to each other via bridging carboxylate groups. The structures are further extended into three-dimensional architectures through extensive inter-layer H-bonding between coordinated water molecules and carboxylate groups. The luminescent properties and thermal stability of both compounds have been investigated.