Structural change of supramolecular coordination polymers of itaconic acid and 1,10-phenanthroline along lanthanide series |
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Authors: | Chong-Bo Liu Meng-Xiao Yu Lin-Pei Jin Song Gao |
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Institution: | a Department of Chemistry, Beijing Normal University, Beijing 100875, PR China b Department of Chemistry, Nanchang University, Nanchang 330047, PR China c Department of Chemistry, Beijing University, Beijing 100875, PR China d Laboratory of Excited States Processes, Chinese Academy of Sciences, Changchun 130021, PR China |
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Abstract: | Five new supramolecular lanthanide coordination polymers with three different structures, {La2(IA)3(phen)2] · 2H2O}n (1), {Ln(IA)1.5(phen)] · xH2O}n x = 1, Ln = Eu (2); x = 0.25, Ln = Dy (3)], and Ln(IA)1.5(phen)]n Ln = Er (4); Yb (5)], were prepared by hydro- and solvothermal reactions of lanthanide chlorides with itaconic acid (H2IA) and 1,10-phenanthroline (phen), and structurally characterized by single crystal X-ray diffraction. 1 Comprises 1-D double-chains that are further assembled to a 3-D supramolecular structure via hydrogen bonds and π-π stacks between phen molecules. 2 and 3 have 2-D infinite networks which are further constructed to form 3-D supramolecular architectures with 1-D channels by π-π aromatic interactions. 4 and 5 have 2-D layer structures consisting of three types of rings which are further architectured to form 3-D supramolecular structures by C-H?O hydrogen bonds. The H2IA ligands are all completely deprotonated and exhibit tetra-, penta-, and hexadentate coordination modes in the titled complexes. The high-resolution emission spectrum of 2 shows only one Eu3+ ion site in 2, which is in agreement with the result of X-ray diffraction. And the magnetic property and the thermal stability of 2 were also investigated. |
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Keywords: | Hydro- and solvothermal syntheses Supramolecular architecture Lanthanides Itaconic acid |
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