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The Photolysis Of The Endoperoxide Of 9,10-Diphenylanthracene

โœ Scribed by W. Drews; R. Shimidt; H.-D. Brauer

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
441 KB
Volume
70
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

Dunng the photolysls of the enooperoxlde of 9.10-diphenylanthracene,two different reactlons are observed, dependmg on the u-radrntron wavelength: (I) Evcltatlon of the SI band causes a homolytlc cleavage of the peroxrde bridge wrth a quantum yield Qz = 0 08. (a) lrradlatlon of the Sz band leads to an sdlabatlc photocleavage of the endoperoxlde mto 9,10dlphenylanthracene and smglet molecular oxygen with a quantum yield Qt = 0 28. Both reactlon pathways confii the theor! of Keams and Khan concerning the photolysls of endoperovldes

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Picosecond laser photolysis study of the
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The formation of heterocoerdianthrone (HCD) following laser pulse photolysis of its endoperoxide (HCDPO) was observed by laser-induced fluorescence. The rise time of HCD was determined to be 7, = 40 &-10 ps. The lifetime of the S,( RT\*) state of HCDPO, from which cycloreversion occurs, was estimate

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Measurements of the quantum yieId of 9,lO-diphcnyIanthracene autoperosidation as a function of dissolved osygtzn concentration in benzene at 25'C are consistent with an intersystem crossin yield of 0.13 + 0.03 for this molecule 2nd the absence of the Spiro-~Ilo~v~d esothermic process SI f 02 3X + TI