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首页> 外文期刊>Crystal growth & design >Syntheses and properties of one-three-dimensional coordination polymers constructed by metallohelicates of purin-containing carboxylate
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Syntheses and properties of one-three-dimensional coordination polymers constructed by metallohelicates of purin-containing carboxylate

机译：含嘌呤的羧酸金属盐构成的一维配位聚合物的合成与性能

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摘要

An acetate-functionalized purine-containing ligand, 2-(6-oxo-6,9-dihydro- 1H-purin-1-yl) acetic acid (H_2L), and its six new one-three-dimensional (1-3D) coordination polymers, [La(HL)_2(NO_ 3)(H_2O)_2]_n (1), [Ce(HL)_ 2(NO_3)(H_2O)_2]_n (2), [Pb(HL)_2(H_2O)_2]_n (3), [Cd(HL)_ 2(H_2O)_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 1-6 are built from the metal-organic helixes of ligands H_ 2L. 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-organic helixes. In those meso compounds, ligands H_2L 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 π···π interactions originating from the bioactive purin group of ligand H_2L greatly contribute to the formation of helical structures and the structural dimension, showing an intriguing ability in the supramolecular assembly. At room temperature, complexes 1-6 exhibit solid-state photoluminescences, with their emission wavelengths and intensities varying according to the central metal ions and the coordination patterns of ligand H_2L. 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.
机译：乙酸盐官能化的含嘌呤配体，2-（6-氧代-6,9-二氢-1H-嘌呤-1-基）乙酸（H_2L）及其六个新的一维（1-3D）配位聚合物[La（HL）_2（NO_ 3）（H_2O）_2] _n（1），[Ce（HL）_2（NO_3）（H_2O）_2] _n（2），[Pb（HL）_2（ H_2O）_2] _n（3），[Cd（HL）_2（H_2O）_2] _n（4），[Cd（L）] _ n（5）和[Zn（L）] _ n（6）是综合和表征。 X射线单晶衍射分析表明，配合物1-6的结构是由配体H_2L的金属-有机螺旋结构构建的。整体结构从1和2的双螺旋链，3和4的2D螺旋网络到5和6的3D配位聚合物，其中包含基于1D金属-有机螺旋的2D同手性层。在那些内消旋化合物中，配体H_2L表现出不同的阴离子状态，桥键模式，尤其是不对称构型，其中乙酸盐和嘌呤之间存在明显的扭曲，有利于按预期方式构建螺旋组装体。来自配体H_2L的生物活性嘌呤基团的大量氢键结合位点和π···π相互作用极大地促进了螺旋结构的形成和结构尺寸，在超分子组装中显示出令人感兴趣的能力。在室温下，配合物1-6表现出固态光致发光，其发射波长和强度根据中心金属离子和配体H_2L的配位模式而变化。另外，已经详细讨论了这些新配合物的热稳定性。特别地，3D聚合物5和6具有更高的热稳定性和更强的蓝色发射，表明在光致发光材料中的潜在应用。

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