Syntheses, structures, and photoluminescence of three-dimensional lanthanide coordination polymers with 2,5-pyridinedicarboxylic acid

• Published in: Journal of solid state chemistry 2008-08, Vol.181 (8), p.1731-1737
• Main Authors: Huang, Yan, Song, Yi-Shan, Yan, Bing, Shao, Min
• Format: Article
• Language: English
• Subjects: 2,5-Pyridinedicarboxylate; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; DECARBOXYLATION; ERBIUM COMPLEXES; EUROPIUM COMPLEXES; Exact sciences and technology; HYDROTHERMAL SYNTHESIS; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Lanthanide coordination polymer; LIGANDS; Materials science; NICOTINIC ACID; NITRATES; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Organic compounds; Other materials; PHOTOLUMINESCENCE; Photoluminescent property; Physics; POLYMERS; Solid organic materials; Specific materials; Structure; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; TERBIUM COMPLEXES; WATER
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2008.03.036

Four new open-framework coordination polymers of lanthanide 2,5-pyridinedicarboxylates, with the formulas Pr2(pydc) 3(H 2O) 2 ( 1), Ln(pydc)(Hpydc) ( Ln=Tb ( 2), Er ( 3), Eu ( 5)), and Gd(pydc)(nic)(H 2O) ( 4) (H 2pydc=2,5-pyridinedicarboxylic acid, Hnic=nicotinic acid), have been hydrothermally synthesized and four of them (except Eu ( 5)) have been structurally characterized. Complex 1 consists of two types of ligand-binding modes contributing to link the PrO 7N(H 2O) polyhedral chains to three-dimensional (3D) open-framework architecture. Complexes 2 and 3 are isostructural and feature unique 3D cage-like supramolecular frameworks remarkably different from that of 1, owing to the different ligand-bridging pattern. Complex 4, however, has the distinct 3D open-framework architecture due to the presence of unexpected nicotinate ligands, which may be derived from pydc ligands via in-situ decarboxylation under the hydrothermal condition. Four new lanthanide coordination polymers have been hydrothermally synthesized by the reaction of 2,5-pyridinedicarboxylic acid with the corresponding lanthanide nitrates, and they show three types of 3D open-framework architecture. Complexes 2 and 5 show strong characteristic green (or red) luminescence and long lifetimes.