Syntheses and Properties of One鈥揟hree-Dimensional Coordination Polymers Constructed by Metallohelicates of Purin-Containing Carboxylate
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- 作者：Xiaoju Yuan ; Xiaoxia Zhang ; Hong Zhao ; Lina Liu ; Benlai Wu
- 刊名：Crystal Growth & Design
- 出版年：2013
- 出版时间：November 6, 2013
- 年：2013
- 卷：13
- 期：11
- 页码：4859-4867
- 全文大小：570K
- 年卷期：v.13,no.11(November 6, 2013)
- ISSN：1528-7505
文摘
An acetate-functionalized purine-containing ligand, 2-(6-oxo-6,9-dihydro-1H-purin-1-yl) acetic acid (H2L), and its six new one鈥搕hree-dimensional (1鈥?D) coordination polymers, [La(HL)2(NO3)(H2O)2]n (1), [Ce(HL)2(NO3)(H2O)2]n (2), [Pb(HL)2(H2O)2]n (3), [Cd(HL)2(H2O)2]n (4), [Cd(L)]n (5), and [Zn(L)]n (6), were synthesized and characterized. Single-crystal X-ray diffraction analyses reveal that the architectures of complexes 1鈥?b>6 are built from the metal鈥搊rganic helixes of ligands H2L. The overall structures range from the double helical chains of 1 and 2, and the 2D helical networks of 3 and 4, to the 3D coordination polymers of 5 and 6, containing 2D homochiral layers based on 1D metal鈥搊rganic helixes. In those meso compounds, ligands H2L display differently anionic states, bridge modes, and especially unsymmetrical configurations with the sharp distortion between the acetate and purin in favor of constructing helical assemblies as expected. The plentiful hydrogen-bonding sites and 蟺路路路蟺 interactions originating from the bioactive purin group of ligand H2L greatly contribute to the formation of helical structures and the structural dimension, showing an intriguing ability in the supramolecular assembly. At room temperature, complexes 1鈥?b>6 exhibit solid-state photoluminescences, with their emission wavelengths and intensities varying according to the central metal ions and the coordination patterns of ligand H2L. Additionally, the thermostabilities of these new complexes have been discussed in detail. In particular, 3D polymers 5 and 6 have extra high thermostabilities and stronger blue emissions, indicating potential applications in photoluminescent materials.