Synthesis,Structures, and Properties of Lanthanide Complexes with Pyrimidine‐2‐carboxylic Acid |
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| Authors: | Panpan Wang Wenlan Chen Jun Xia |
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| Affiliation: | School of Environment and Chemical Engineering, Tianjin Polytechnic University, Tianjin, P. R. China |
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| Abstract: | Six lanthanide complexes Ln(pmc)2NO3]n Hpmc = pyrimidine‐2‐carboxylic acid, Ln = La ( 1 ), Pr ( 2 )], Ln(pmc)2(H2O)3]NO3 · H2O Ln = Eu ( 3 ), Tb ( 4 ) Dy ( 5 ), Er ( 6 )] were synthesized by the reactions of lanthanide nitrate and pyrimidine‐2‐carboxylic acid in water at room temperature. These complexes were characterized by single‐crystal X‐ray diffraction analysis, elemental analysis, IR, circular dichroism (CD) and fluorescence spectra. Structure analysis shows that complexes 1 and 2 are isostructural with P43212 space group, whereas isostructural complexes 3 – 6 belong to the P21/c space group. In complexes 1 and 2 , the central metal atoms are coordinated by nitrates and pmc–, which are self‐assembled to construct a 3D porous network with 62.62.62.62.62.62 (66) topology. In complexes 3 – 6 , H2O and pmc– ligands are coordinated and the complexes exhibit a one‐dimensional zigzag chain, which is further expanded into a 3D structure by hydrogen bonding. In addition, the circular dichroism of 1 and 2 proves that the two complexes are both chiral with achiral ligand of Hpmc. Luminescent measurements of compounds 3 – 5 indicate that the characteristic fluorescence of Eu3+, Tb3+, and Dy3+ are observed. |
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| Keywords: | Crystal structure Lanthanides Luminescence Chiral complexes |
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