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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >A fourfold interpenetrating cadmium(II) metal–organic framework based on 2,4,6‐tris(pyridin‐4‐yl)‐1,3,5‐triazine with reversible photochromic properties
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A fourfold interpenetrating cadmium(II) metal–organic framework based on 2,4,6‐tris(pyridin‐4‐yl)‐1,3,5‐triazine with reversible photochromic properties

机译：基于2,4,6-三（Pyridin-4-基）-1,3,5-三嗪的四倍互穿镉（II）金属有机骨架，具有可逆光致变色特性

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摘要

2,4,6‐Tris(pyridin‐4‐yl)‐1,3,5‐triazine (tpt), as an organic molecule with an electron‐deficient nature, has attracted considerable interest because of its photoinduced electron transfer from neutral organic molecules to form stable anionic radicals. This makes it an excellent candidate as an organic linker in the construction of photochromic complexes. Such a photochromic three‐dimensional (3D) metal–organic framework (MOF) has been prepared using this ligand. Crystallization of tpt with Cd(NO 3 ) 2 ·4H 2 O in an N , N ‐dimethylacetamide–methanol mixed‐solvent system under solvothermal conditions afforded the 3D MOF poly[[bis(nitrato‐κ 2 O , O ′)cadmium(II)]‐μ 3 ‐2,4,6‐tris(pyridin‐4‐yl)‐1,3,5‐triazine‐κ 3 N 2 : N 4 : N 6 ], [Cd(NO 3 ) 2 (C 18 H 12 N 6 )] n , which was characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis and single‐crystal X‐ray diffraction. The X‐ray diffraction crystal structure analysis reveals that the asymmetric unit contains one independent Cd II cation, one tpt ligand and two coordinated NO 3 ? anions. The Cd II cations are connected by tpt ligands to generate a 3D framework. The single framework leaves voids that are filled by mutual interpenetration of three independent equivalent frameworks in a fourfold interpenetrating architecture. The compound shows a good thermal stability and exhibits a reversible photochromic behaviour, which may originate from the photoinduced electron‐transfer generation of radicals in the tpt ligand.
机译：2,4,6-三（Pyridin-4-基）-1,3,5-三嗪（TPT）作为具有电子无缺氧性质的有机分子，由于其从中性有机的光诱导的电子转移引起了相当大的兴趣分子形成稳定的阴离子自由基。这使其成为光致变色络合物构造中的有机接头的优异候选者。使用该配体制备这种光致变色三维（3D）金属 - 有机框架（MOF）。在溶剂热条件下在N，N-二甲基乙酰胺 - 甲醇混合溶剂体系中结晶CD（NO 3）2·4H 2 O，得到3D MOF Poly [[双（Nitrato-κ2o，O'）镉（ II）] - μ3 -2,4,6-三（吡啶-4-基）-1,3,5-三嗪-κ3N2：N 4：N 6]，[CD（NO 3）2（ C 18 H 12 N 6）] N，其特征在于IR光谱，元素分析，热重分析和单晶X射线衍射。 X射线衍射晶体结构分析表明，不对称单元含有一个独立的CDI II阳离子，一个TPT配体和两个协调的NO 3？阴离子。 CDI II阳离子通过TPT配体连接，以产生3D框架。单个框架使空隙留下了通过相互互通的三个独立的等效框架在四倍互补架构中填充的空隙。该化合物显示出良好的热稳定性，并且表现出可逆的光致变色行为，其可以源于TPT配体中的光诱导的电子转移产生的基团。

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