Poon Chun-Ting, Lam Wai Han, Wong Hok-Lai, Yam Vivian Wing-Wah
Institute of Molecular Functional Materials [Area of Excellence Scheme, University Grants Committee (Hong Kong)] and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P.R. China).
Chemistry. 2015 Jan 26;21(5):2182-92. doi: 10.1002/chem.201404784. Epub 2014 Dec 2.
A series of dithienylethene-containing triarylboranes has been designed, synthesized, and characterized. The electrochemistry, photophysics, and photochromic behavior have also been studied. The photophysical and photochromic properties could be facilely tuned in this system by varying the thiophene spacers (thiophene, thienothiophene, and bithiophene) between the dithienylethene and the dimesitylboron (BMes2 ) or the position of the BMes2 substitution in the thiophene spacers. The absorption of closed form has been found to be more sensitive towards the structural modification upon incorporation of the BMes2 unit. Moreover, multi-addressable photochromic reactivity is obtained upon addition of Lewis base (F(-) ), which is due to the formation of boron-Lewis base adduct. The dependence of the photophysical and photochromic properties on the thiophene spacers and the position of the BMes2 substitution has been further supported by computational studies.
设计、合成并表征了一系列含二噻吩乙烯的三芳基硼烷。还研究了其电化学、光物理和光致变色行为。通过改变二噻吩乙烯与二甲基硼（BMes2）之间的噻吩间隔基（噻吩、噻吩并噻吩和联噻吩）或BMes2在噻吩间隔基中的取代位置，可在该体系中轻松调节光物理和光致变色性能。已发现，在引入BMes2单元后，闭环形式的吸收对结构修饰更为敏感。此外，加入路易斯碱（F(-)）后可获得多可寻址光致变色反应性，这是由于形成了硼-路易斯碱加合物。计算研究进一步支持了光物理和光致变色性能对噻吩间隔基和BMes2取代位置的依赖性。
