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Crystal structure and photoreactivity of a halogen-bonded cocrystal based upon 1,2-diiodoperchlorobenzene and 1,2-bis(pyridin-4-yl)ethylene.
Acta Crystallographica Section C ( IF 0.7 ) Pub Date : 2020-05-13 , DOI: 10.1107/s2053229620006233
Eric Bosch 1 , Jessica D Battle 2 , Ryan H Groeneman 2
Affiliation  

The formation of a photoreactive cocrystal based upon 1,2‐diiodoperchlorobenzene (1,2‐C6I2Cl4) and trans‐1,2‐bis(pyridin‐4‐yl)ethylene (BPE) has been achieved. The resulting cocrystal, 2(1,2‐C6I2Cl4)·(BPE) or C6Cl4I2·0.5C12H10N2, comprises planar sheets of the components held together by the combination of I…N halogen bonds and halogen–halogen contacts. Notably, the 1,2‐C6I2Cl4 molecules π‐stack in a homogeneous and face‐to‐face orientation that results in an infinite column of the halogen‐bond donor. As a consequence of this stacking arrangement and I…N halogen bonds, molecules of BPE also stack in this type of pattern. In particular, neighbouring ethylene groups in BPE are found to be parallel and within the accepted distance for a photoreaction. Upon exposure to ultraviolet light, the cocrystal undergoes a solid‐state [2 + 2] cycloaddition reaction that produces rctt‐tetrakis(pyridin‐4‐yl)cyclobutane (TPCB) with an overall yield of 89%. A solvent‐free approach utilizing dry vortex grinding of the components also resulted in a photoreactive material with a similar yield.

中文翻译:

基于1,2-二碘过氯苯和1,2-双(吡啶-4-基)乙烯的卤素键合共晶体的晶体结构和光反应性。

已经实现了基于1,2-二碘过氯苯(1,2-C 6 I 2 Cl 4)和反式1,2-双(吡啶-4-基)乙烯(BPE)的光反应性共晶体的形成。所得的共晶体2(1,2-C 6 I 2 Cl 4)·(BPE)或C 6 Cl 4 I 2 ·0.5C 12 H 10 N 2,包括通过I的结合而保持在一起的组分的平面片…N个卤素键和卤素-卤素接触。值得注意的是1,2-C 6 I 2Cl 4分子以均匀且面对面的方向π堆积,形成无限大的卤素键供体。由于这种堆叠结构和I…N卤素键,BPE分子也以这种类型的模式堆叠。特别地,发现BPE中的相邻亚乙基是平行的并且在光反应可接受的距离内。暴露于紫外线下,共晶体经历固态[2 + 2]环加成反应,生成rctt-四(吡啶-4-基)环丁烷(TPCB),总产率为89%。利用组件的干涡流研磨的无溶剂方法也可以得到具有相似产率的光反应性材料。
更新日期:2020-05-13
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