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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >The photochromic behaviour of two viologen salts modulated by the distances between the halide anions and the cationic N atoms of viologen
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The photochromic behaviour of two viologen salts modulated by the distances between the halide anions and the cationic N atoms of viologen

机译：卤化物阴离子与阳离子阳离子距离调节两种viololgen盐的光致变色行为

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摘要

In recent years, viologens and their derivatives have received much attention due to their various potential applications, ranging from electro‐ or photochromic devices to clean energy. Generally, viologen compounds exhibit a colour change upon being subjected to an external stimulus. However, the chromic mechanism is still ambiguous, because there are many electron‐transfer pathways for a chromic compound that need to be considered. Thus, exploring new chromic viologen‐based compounds with one pathway should be important and meaningful. In this article, two new viologen‐based derivatives, namely 1‐(2‐cyanobenzyl)‐4,4′‐bipyridinium chloride ( o ‐CBbpy·Cl), C 18 H 14 N 3 + ·Cl ? ( 1 ), and 1‐(2‐cyanobenzyl)‐4,4′‐bipyridinium bromide ( o ‐CBbpy·Br), C 18 H 14 N 3 + ·Br ? ( 2 ), have been synthesized and characterized. Interestingly, both isomorphic compounds possess only one electron‐transfer pathway, in which 1‐(2‐cyanobenzyl)‐4,4′‐bipyridinium cations ( o ‐CBbpy) and halide anions are employed as electron donors and acceptors, respectively. Salts 1 and 2 consist of o ‐CBbpy cations involved in π–π interactions and hydrogen‐bond interactions, and halide anions weakly hydrogen bonded to the viologen cations. The salts show different photoresponsive characteristics under identical conditions, which should be mainly related to the distances between the halide cations and the cationic N atoms of o ‐CBbpy but not the electronegativities of the halogen atoms. These results should not only help in understanding that the distance of the electron‐transfer pathway plays an important role in viologen‐based photochromism, but should also guide the design and synthesis of additional photochromic materials.
机译：近年来，由于各种潜在的应用，Viologens及其衍生物受到了很多关注的，从电镀或光致变色装置测量到清洁能量。通常，在经受外部刺激时，Viologen化合物表现出颜色变化。然而，铬机制仍然模糊，因为需要考虑铬化合物的许多电子转移途径。因此，用一种途径探索新的铬磷化物基化合物应该是重要的和有意义的。在本文中，两种新的基于Viololgen的衍生物，即1-（2-氰苄基）-4,4'-双氯化氯（氯化物（O-CBBPY·Cl），C 18 H 14 n 3 +·Cl？ （1），和1-（2-氰基苄基）-4,4'-双溴化吡啶（O-CBBPY·BR），C 18 H 14 N 3 +·BR？ （2）已被合成并表征。有趣的是，两种同义化合物只具有一种电子转移途径，其中1-（2-氰基苄基）-4,4'-双嘧啶阳离子（O-CBBPY）和卤化物阴离子分别用作电子供体和受体。 Salts 1和2由π-π相互作用和氢键相互作用的O-CBBPY阳离子组成，卤化物阴离子粘合到Violologen阳离子的氢氢。盐在相同的条件下显示出不同的光响应特征，其应主要与卤化物阳离子和阳离子N原子之间的距离相关但不是卤素原子的电气的距离。这些结果不仅有助于了解电子转移途径的距离在基于Viologen的光学变色中起重要作用，而且还应该指导额外的光致变色材料的设计和合成。

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