Syntheses, structures and photoluminescence of a series of lanthanide-organic frameworks involving in situ ligand formation |
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Authors: | Xiandong Zhu Shuiying Gao Hongxun Yang Bo Xu |
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Affiliation: | a State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China b Department of Biochemical Engineering, Anhui University of Technology and Science, Wuhu 241000, PR China |
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Abstract: | A series of lanthanide-organic frameworks with aromatic pyridinecarboxylate ligand, generally formulated as [Ln(PYDC)(C2O4)0.5(H2O)2]·H2O (LnPr(1), Nd(2), Eu(3), Gd(4), Tb(5), Er(6); H2PYDC3,4-pyridinedicarboxylic acid) have been successfully synthesized and characterized. Their isostructures are built up from one-dimensional (1D) infinite chains cross-linked via the tri-connected PYDC ligands, leading to the two-dimensional (2D) layer structure. The adjacent layers are further extended into three-dimensional (3D) supramolecular frameworks through hydrogen bonding and π-π stacking interactions. Interestingly, the oxalate bridging ligand is believed to form via in situ ligand synthesis through decarboxylation of the organic precursor, H2PYDC. Complexes 3 and 5 exhibit strong fluorescent emissions in the visible region at room temperature. |
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Keywords: | Lanthanide-organic frameworks In situ reaction Photoluminescence |
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