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首页> 外文期刊>Crystal growth & design >Water Switched Reversible Thermochromism in Organic Salt of Sulfonated Anil
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Water Switched Reversible Thermochromism in Organic Salt of Sulfonated Anil

机译：磺化Anil有机盐中的水开关可逆热切割

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We report concomitant stoichiomorphs [(4,4'-BPY-2H)(2+)(SA-SY-H)(-)(2)center dot 4H(2)O] 1 and [(4,4'-BPY-H)(+)(SA-SY-H)(-)center dot 4H(2)O] 2 formed in the same reaction vessel, with formation of 2 following 1. The expeditious formation of 1 with half equivalent of bipyridyl former, attributed to 2-fold bifurcated methoxy assisted hydroxyl-pyridinium synthon, leaves behind the solution with an excess of bipyridyl, resulting in the formation of 2. Organic salts 1 and 2 crystallize as triclinic ((P) over bar1) and monoclinic (P21/c) tetrahydrates, with D3 acyclic non-branched and branched lattice water clusters. Hirshfeld and fingerprint studies reveal reciprocal O-H center dot center dot center dot H-O and weak dispersive H center dot center dot center dot H contacts are the major intermolecular interactions responsible for supramolecular aggregation. Interestingly, 1 exhibits reversible thermochromism switched by lattice water, while 2 is not thermochromic. Photochromism in both sulfonated anil based organic salts 1 and 2 is ruled out due to the significantly lower V-free value than required for the free rotation about the imine bond to generate cis-trans isomers. Keto-enol prototropism-triggered thermochromism is also ruled out because of the intramolecular sulfonate proton shift to the imine nitrogen as well as the position of absorption curves in the Kubelka-Munk plots. The lattice water switched mechanism for reversible thermochromism in 1 is proposed and substantiated by FT-IR, TGA-DTA, DR-UV, and P-XRD studies and further validated by the Tauc plots. To the best of our knowledge, 1 represents the first example of water-triggered all-organic reversible thermochromic material and has been utilized as a thermal sensor for the reflux reactions in low boiling solvents.
机译：我们报道了在同一反应容器中同时形成的[（4,4'-BPY-2H）（2+）（SA-SY-H）（）（2）中心点4H（2）O]1和[（4,4'-BPY-H）（+）（SA-SY-H）（）中心点4H（2）O]2的化学同质性，其中2是在1之后形成的。由于2倍分叉的甲氧基辅助羟基吡啶合子，1与半当量联吡啶前体迅速形成，留下了含有过量联吡啶的溶液，导致2的形成。有机盐1和2结晶为三斜晶系（（P）在bar1上）和单斜晶系（P21/c）四水合物，具有D3无环非支化和支化晶格水簇。Hirshfeld和指纹研究表明，互易的O-H中心点H-O和弱分散的H中心点H接触是导致超分子聚集的主要分子间相互作用。有趣的是，1表现出由晶格水切换的可逆热致变色，而2则不是热致变色。磺化苯胺基有机盐1和2的光致变色被排除在外，因为其无V值明显低于围绕亚胺键自由旋转生成顺反异构体所需的值。由于分子内磺酸盐质子向亚胺氮转移，以及吸收曲线在Kubelka-Munk图中的位置，也排除了酮-烯醇原向性引发的热致变色。提出了1中可逆热致变色的晶格水开关机制，并通过FT-IR、TGA-DTA、DR-UV和P-XRD研究证实，并通过Tauc图进一步验证。据我们所知，1代表了水触发的全有机可逆热致变色材料的第一个示例，并已被用作低沸点溶剂中回流反应的热传感器。

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