Reversible Laser-Induced Bending of Pseudorotaxane Crystals
Reversible Laser-Induced Bending of Pseudorotaxane Crystals
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DOI：
10.1021/jacs.7b10998
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发表时间：
2018-01-10
影响因子：
15
通讯作者：
Horie, Masaki
中科院分区：
文献类型：
--
作者：
Cheng, Shao-Chi;Chen, Kai-Jen;Horie, Masaki
本研究研究了轴成分中含有偶氮苯和二茂铁基的拟轮烷晶体的动态光响应。 X射线晶体学显示，环状组分中具有甲基偶氮苯基团和二溴亚苯基环的拟轮烷表现出反式偶氮苯基团的扭曲，扭转角分别为17度和38度。对晶体进行 360 和 445 nm 的重复交替激光照射，会产生相反方向 20-30 度的弯曲，并且没有衰减的迹象。在44S nm照射下，0.3秒内发生弯曲。由于平面反式偶氮苯基团之间的多重 pi-pi 相互作用，未取代的拟轮烷晶体在 360 nm 照射下仅显示 2 度的弯曲。拟轮烷晶体具有两个发色团，在照射时会快速且可逆地弯曲，弯曲速率取决于分子结构。
This study investigated the dynamic photo-response of pseudorotaxane crystals with azobenzene and ferrocenyl groups in the axle component. X-ray crystallography showed pseudorotaxanes with a methylazobenzene group and a dibromophenylene ring in the cyclic component to exhibit twisting of the trans-azobenzene groups at torsion angles of 17 degrees and 38 degrees, respectively. Repeated alternating laser irradiation of the crystals at 360 and 445 nm produced bending of 20-30 degrees in opposite directions, with no evidence of decay. Under 44S nm irradiation, bending took place within 0.3 s. A crystal of nonsubstituted pseudorotaxane showed bending of only 2 degrees under 360 nm irradiation due to multiple pi-pi interactions between the planar trans-azobenzene groups. The pseudorotaxane crystals have two chromophores, bent rapidly and reversibly on irradiation at rates depending on the molecular structure.