Photochemistry and photophysics of the endoperoxide of mesodiphenylhelianthrene: a contribution to the localization of the S1(π*σ*) state of aromatic endoperoxides
作者:Reinhard Schmidt
DOI:10.1039/c2pp05382a
日期:2012.6
The endoperoxide of mesodiphenylhelianthrene MDHPO has been studied in detail with respect to fluorescence and photo-induced rearrangement. MDHPO proved to be non-fluorescent, although its absorption spectrum is dominated at the low energy side by a strong ππ* band with a maximum at 429.5 nm. Irradiation of that band effects rearrangement to the corresponding diepoxide MDHDO, a reaction typical for S1(π*σ*) excited endoperoxides (EPOs). The absorption spectrum of the product MDHDO is blue shifted by only 3.5 nm. MDHDO has the same extended planar aromatic system like its precursor MDHPO, but MDHDO fluoresces strongly. These results set the excitation energy of the S1(π*σ*) state of MDHPO to ≤23 000 cm−1, which is considered to be a generally realistic value of the S1(π*σ*) state energy of aromatic EPOs. The main reaction of S1(π*σ*) excited MDHPO is, however, chemical deactivation to ground state MDHPO via an oxygen biradical. The sequence of O-O bond opening and closing is the general way of repopulation of the S0 state of aromatic EPOs from S1(π*σ*) excited states.
actinometer, mesodiphenylhelianthrene (MDH), is reported from a commercially available compound. Full characterization of the intermediates of the synthetic route and the final product MDH are presented together with four crystal structures of intermediates and MDH. The usage of the actinometer is described, and finally, the structure of the endoperoxide species (MDHPO), which is formed after irradiation
据报道,一种安全的五步合成路线可产生可靠的化学光度计 mesodiphenylhelianthrene ( MDH ),来自一种市售化合物。对合成路线的中间体和最终产物MDH的完整表征以及中间体和MDH的四种晶体结构进行了介绍。介绍了光度计的使用方法,最后从实验和理论上阐明了MDH辐照后形成的内过氧化物(MDHPO )的结构。
Brockmann; Dicke, Chemische Berichte, 1970, vol. 103, p. 7,13
作者:Brockmann、Dicke
DOI:——
日期:——
Photoinduced Oxidation of Diphenylbisanthene and Its Spectral Manifestations
作者:S. M. Arabei、T. A. Pavich
DOI:10.1023/b:japs.0000032873.77613.9b
日期:2004.3
Sauvage, Annales de Chimie (Cachan, France), 1947, vol. <12> 2, p. 844,859