制备二噻吩乙烯桥联的二卟啉1-6作为光化学转换分子。卟啉和二噻吩基乙烯在1中直接连接,并分别通过2中的1,4-亚苯基间隔基,3中的4-乙炔基亚苯基间隔基和4中的二-4-苯基乙炔基间隔基连接,而内乙炔基化卟啉和二噻吩基乙烯在5中直接连接,并在6中通过1,4-亚苯基间隔基连接。化合物1、2和5不会进行任何光化学异构化,这可能是由于所连接的卟啉部分通过分子内能量转移。化合物4和6经历开闭和开闭的光异构化,量子产率分别为4.3 x 10(-)(2)和1.8 x 10(-)(3)和2.6 x 10(-)(3) )和7.5 x 10(-)(4),通过用313和625 nm的光照射,这远小于参比二噻吩乙烯乙烯分子7的量子产率0.52和3.8 x 10(-)(3)。通过二噻吩乙烯乙烯的光异构化,可逆地调节4的荧光。部分。另外,卟啉在6中的吸收性质响应于二噻吩基乙烯桥的光致变色反应而改变。
closed-to-open photoisomerizations in quantum yields of 4.3 x 10(-)(2) and 1.8 x 10(-)(3), and 2.6 x 10(-)(3) and 7.5 x 10(-)(4), respectively, by irradiation with 313 and 625 nm light, which are considerably smaller than quantum yields of 0.52 and 3.8 x 10(-)(3) for reference dithienylethene molecule 7. The fluorescence of 4 was regulated in a reversible manner by the photoisomerization of the dithienylethene
制备二噻吩乙烯桥联的二卟啉1-6作为光化学转换分子。卟啉和二噻吩基乙烯在1中直接连接,并分别通过2中的1,4-亚苯基间隔基,3中的4-乙炔基亚苯基间隔基和4中的二-4-苯基乙炔基间隔基连接,而内乙炔基化卟啉和二噻吩基乙烯在5中直接连接,并在6中通过1,4-亚苯基间隔基连接。化合物1、2和5不会进行任何光化学异构化,这可能是由于所连接的卟啉部分通过分子内能量转移。化合物4和6经历开闭和开闭的光异构化,量子产率分别为4.3 x 10(-)(2)和1.8 x 10(-)(3)和2.6 x 10(-)(3) )和7.5 x 10(-)(4),通过用313和625 nm的光照射,这远小于参比二噻吩乙烯乙烯分子7的量子产率0.52和3.8 x 10(-)(3)。通过二噻吩乙烯乙烯的光异构化,可逆地调节4的荧光。部分。另外,卟啉在6中的吸收性质响应于二噻吩基乙烯桥的光致变色反应而改变。
Photoswitching of the Triplet Excited State of DiiodoBodipy-Dithienylethene Triads and Application in Photo-Controllable Triplet–Triplet Annihilation Upconversion
作者:Jie Ma、Xiaoneng Cui、Fen Wang、Xueyan Wu、Jianzhang Zhao、Xingwei Li
DOI:10.1021/jo5018662
日期:2014.11.21
fluorescence of Bodipy was quenched and the triplet state lifetime of Bodipy was reduced from 105.1 to 40.9 μs. The photoreversion is O2-independent, but can be greatly accelerated upon selective photoexcitation into the diiodoBodipy absorption band (at 535 nm). We concluded that ISC is not outcompeted by RET. The photoswitching of the triplet state was transduced to the singlet oxygen photosensitizing, as well