Syntheses,characterization and luminescent properties of two lead(II) fumarate metal-organic frameworks |
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| Authors: | Kou-Lin Zhang Wei Liang Yan Chang Li-Min Yuan Seik Weng Ng |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, PR China;2. Test and Analysis Center, Yangzhou University, Yangzhou 225002, PR China;3. Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | It is of interest that the hydrous 3D metal-organic framework (MOF) {Pb2(fum)2(H2O)4] · 2H2O}n (1) has been synthesized by the reaction of the fum dianion with the lead(II) ion (fum = fumarate) in the presence of pyrazole, while the anhydrous 3D MOF Pb(fum)]n (2) is obtained by the reaction of the fum dianion with the lead(II) ion in the presence of pyrazine. These complexes were further characterized by FT-IR spectroscopy, thermogravimetric analysis (TG), X-ray analysis and solid state photoluminescence spectra. The arrangement of the ligands displays a coordination gap around the Pb atom, occupied possibly by a stereoactive lone pair of electrons on lead(II), with the coordination around both the eight-coordinated lead atom in 1 and six-coordinated lead atom in 2 exhibiting a hemidirected geometry. The fum ligand shows different ligation behavior toward the lead(II) ions in these complexes. These compounds exhibit photoluminescence with the maximum emission located in the UV region. |
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| Keywords: | Lead(II) complexes Characterization MOFs Coordination gap Photoluminescence |
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