Lanthanide-organic frameworks constructed from multi-functional ligands: Syntheses, structures, near-infrared and visible photoluminescence properties

摘要

A series of multi-functional ligands supported lanthanide-organic frameworks, formulated as [Ln(HL1)(H2L2)(0.5)(H4L2)(0.5)(H2O)]center dot(H2O)(1.5)center dot{Ln = La (1), Pr (2), Nd (3), Sm (4). Eu (5): H3L1 = 5-Sulfosaclicylic acid; H4L2 = N,N'-piperazine (bis-methylene phosphonic acid)), have been synthesized by hydrothermal reactions. Single crystal X-ray diffractions and powder XRD patterns confirm they are isostructural. They feature 3D framework structures based on extension of a "zigzag" inorganic chain by organic linkers. Moreover, the photoluminescence properties of 5 and 3 have been investigated, and they show strong solid-state emissions in the visible and near-infrared (IR) regions at room temperature. (C) 2009 Elsevier Inc. All rights reserved.