Dual emission via remote control of molecular rotation of o-carborane in the excited state by the distant substituents in tolane-modified dyads
Dual emission via remote control of molecular rotation of o-carborane in the excited state by the distant substituents in tolane-modified dyads
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DOI：
10.1039/c7nj04283c
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发表时间：
2018-03
影响因子：
3.3
通讯作者：
Kenta Nishino;Kyoya Uemura;Kazuo Tanaka;Y. Chujo
中科院分区：
文献类型：
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作者：
Kenta Nishino;Kyoya Uemura;Kazuo Tanaka;Y. Chujo
基于在二苯乙炔部分具有各种取代基的二苯乙炔-邻-碳硼烷二联体，报道了双发射性质及其环境响应性。合成并表征了一系列邻碳硼烷二元化合物。结果表明，它们的发光颜色受二苯乙炔结构上取代基的影响。一些具有强给电子取代基的衍生物如-OMe、-（OMe）3和-NMe 2在辛烷溶液中同时显示出平行构象的局部激发态（LE）和扭曲构象的分子内电荷转移（ICT）的双发射带。此外，通过加热改变两个发射带之间的强度比。这些结果意味着邻碳硼烷二元体系的电子性质可以通过电子共轭的取代基上的给电子性质的程度来调节。
Dual-emissive properties and their environment responsiveness are reported based on the tolane-o-carborane dyad having various substituents at the tolane moiety. A series of o-carborane dyads were synthesized and characterized. It was shown that their luminescent colors were tuned by the substituents at the tolane moiety. Some derivatives with strong electron-donating substituents such as –OMe, –(OMe)3 and –NMe2 simultaneously showed dual emission bands from the locally-excited (LE) state in the parallel conformation and an intramolecular charge transfer (ICT) state in the twisted one in the octane solution. Furthermore, intensity ratios between two emission bands were varied by heating. These results mean that the electronic properties of the o-carborane dyad system can be modulated by the degree of electron donating properties at the substituents via electronic conjugation.