Systematic investigations on fused π-system compounds of seven benzene rings prepared by photocyclization of diphenanthrylethenes
作者:Shota Fujino、Minoru Yamaji、Hideki Okamoto、Toshiki Mutai、Isao Yoshikawa、Hirohiko Houjou、Fumito Tani
DOI:10.1039/c7pp00040e
日期:2017.6
(nEm; n, m = 1, 3 and 9) for understanding photocyclization patterns based on NMR spectroscopy. The crystal structures of the photoproducts were analyzed by X-ray crystallography, and the photophysical features of the photocyclized molecules were investigated based on emission and transient absorptionmeasurements. Phenanthrene derivatives substituted at the 1- and 3-positions were prepared for synthesizing
我们研究了1-(n-菲基)-2-(m-菲基)乙烯的光产物(n E m;n,m = 1、3和9),以了解基于NMR光谱的光环化模式。通过X射线晶体学分析光产物的晶体结构,并基于发射和瞬态吸收测量来研究光环化分子的光物理特征。制备了在1-位和3-位取代的菲衍生物,用于通过二苯乙烯衍生物的光环化合成n E m。我们获得了四种主要的光产品(n @ m)从相应的n E m。通过X射线晶体学测定,发现其中两个在单晶中具有外消旋分子结构。除了主要的光产物外,还分离出两种类型的次要光产物(n @ m PP)。在溶液中测定了获得的光产物的荧光量子产率和寿命,而在粉末中获得了确定的荧光量子产率。通过激光光解技术观察溶液中的三重态-三重态吸收光谱表明,跨系统进入三重态的过程与荧光过程竞争。
Photodehydrocyclizations in stilbene-like compounds—III
作者:W.H. Laarhoven、T.H.J.H.M. Cuppen、R.J.F. Nivard
DOI:10.1016/s0040-4020(01)93139-4
日期:1970.1
Photodehydrocyclizations in stilbene-like compounds take place only if the sum of the free valence numbers of the atoms concerned in the cyclization step exceeds in the excited state, a value of 1. If more than one cyclization is possible the photoconversion follows the pathway for which ΣF* is maximal; if ΔΣF* for various cyclizations is smaller than 0·1 a second product is sometimes formed.