All‐Visible‐Light Triggered Photoswitch of Dithienylethene Derivatives with Molecular Conformation Changes Excess 5 Å
All‐Visible‐Light Triggered Photoswitch of Dithienylethene Derivatives with Molecular Conformation Changes Excess 5 Å
复制标题
分子构象变化超过 5 的二噻吩乙烯衍生物的全可见光触发光开关
DOI：
10.1002/adfm.202211009
复制
发表时间：
2022
影响因子：
19
通讯作者：
Zhenguo Chi
中科院分区：
文献类型：
--
作者：
Miao Luo;Juan Zhao;Yanyan Liu;Zhu Mao;Sheng Wang;Zhenguo Chi
新型全可见光驱动荧光分子开关在材料科学和生命科学领域具有重要的应用前景，引起了人们的广泛关注。本文设计并制备了三种新型的全可见光触发荧光分子光开关（2P3、4F和4cl），它们是通过增加聚集诱导发射单元的π共轭长度来实现的。在420 nm和560 nm的辐照下，这些光开关在稀溶液和薄膜中显示可逆的光致变色和荧光开关。同时，在450nm / 560nm光的交替照射下，也实现了粉末状态下的有效光致变色和荧光切换。更有趣的是，溶剂极性可以改变具有不同光致变色能力的两种不同构象。这两种构象在垂直方向上的尺寸差异大于5 Å，这是二乙烯基光致变色分子中变化最大的构象之一。分析了伴随的构象变化，以了解溶剂特性和晶体结构之间的关系，以及全可见光触发的光开关分子在固态下的分子间相互作用。
Developing new all‐visible‐light driven fluorescent molecular switches has attracted much interests due to their important application prospects in materials science and life science. Herein, three novel all‐visible‐light triggered fluorescent molecular photoswitches (2P3,4F, and4Cl) are designed and prepared, which are realized by prolonging π‐conjugation length with aggregated‐induced emission units. These photoswitches show reversible photochromic and fluorescent switching in dilute solutions and films under 420 nm and 560 nm irradiations. Meanwhile, upon alternating irradiations with 450 nm/560 nm light, effective photochromic and fluorescent switching in powder states are also achieved. More interestingly, two distinct conformations with different photochromic abilities can be altered by solvents polarity. The size difference of the two conformations is over 5 Å in the vertical direction which is one of the largest changes among photochromic molecules based on dithienylethene. The accompanying conformational changes are analysed to understand the relationship between solvent characteristics and crystal structure, as well as the intermolecular interaction in solid state for all‐visible‐light triggered photoswitching molecules.