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Reversible Color and Shape Changes of Nanostructured Fibers of a Macrocyclic π-Extended Thiophene Hexamer Promoted by Adsorption and Desorption of Organic Vapor
Journal of the American Chemical Society ( IF 15.0 ) Pub Date : 2020-07-22 , DOI: 10.1021/jacs.0c05340
Masahiko Iyoda 1 , Masataka Takashika 2 , Masashi Hasegawa 3 , Hiroyuki Otani 2 , Saori Mizuno 2 , Kazuhira Miwa 4 , Wakana Kariya 2 , Toshihiro Fujiwara 2 , Hideyuki Shimizu 1 , Shinobu Aoyagi 4
Affiliation  

A phenyl-substituted macrocyclic π-extended thiophene hexamer 1, composed of four thienylene-ethynylene and two thienylene-vinylene units, has a solid-state structure in which π-π, CH-π, and van der Waals interactions occur. Slow addition of acetone to a solution of 1 in CS2 produces a yellow nanostructured fiber 1-A containing a 1:1.5:1 ratio of 1, acetone and CS2. Over a 2 min period at 25 °C 1-A gradually changes to an orange fiber 1-B containing a 1:0.5:1 ratio of 1, acetone and CS2. On exposure to acetone vapor, 1-B regenerates 1-A (vapochromism), and removal of all solvents from 1-A and 1-B generates a red-orange fiber 1-C, which upon brief immersion in acetone/CS2 produces 1-A. Furthermore, 1-C is converted to orange yellow fiber 1-D upon exposure to acetone vapor for 1 sec at 25 °C. Analysis of the horizontal and vertical profiles of the X-ray diffraction (XRD) patterns shows that removal of solvent from 1-A reversibly creates 1-B in conjunction with a shape and size change along with arching.

中文翻译:

有机蒸气吸附和解吸促进大环π-扩展噻吩六聚体纳米结构纤维的可逆颜色和形状变化

苯基取代的大环 π 扩展噻吩六聚体 1,由四个噻吩基-乙炔基和两个噻吩基-亚乙烯基单元组成,具有固态结构,其中发生 π-π、CH-π 和范德华相互作用。将丙酮缓慢添加到 1 在 CS2 中的溶液中会产生黄色纳米结构纤维 1-A,其中 1、丙酮和 CS2 的比例为 1:1.5:1。在 25 °C 的 2 分钟内,1-A 逐渐变为橙色纤维 1-B,其中 1、丙酮和 CS2 的比例为 1:0.5:1。暴露在丙酮蒸气中时,1-B 会再生 1-A(汽色),从 1-A 和 1-B 中去除所有溶剂会生成红橙色纤维 1-C,将其短暂浸入丙酮/CS2 中会产生-一种。此外,在 25°C 下暴露于丙酮蒸气 1 秒后,1-C 会转化为橙黄色纤维 1-D。
更新日期:2020-07-22
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