Photophysical and photochemical processes of 9,10-dihydro-9-silaphenanthrene derivatives: photochemical formation and electronic structure of 9-silaphenanthrenes.
J Phys Chem A
; 110(11): 3868-74, 2006 Mar 23.
Article
in En
| MEDLINE
| ID: mdl-16539407
ABSTRACT
Photophysical and photochemical processes of 9-methyl- and 9-phenyl-9,10-dihydro-9-silaphenanthrene derivatives have been studied at room temperature and 77 K in comparison with the carbon analogue, 9,10-dihydrophenanthrene. These 9,10-dihydro-9-silaphenanthrene derivatives show smaller fluorescence quantum yield and remarkably larger Stokes shifts than those of the carbon analogue. In contrast, their phosphorescence quantum yields are two times larger than those of the carbon analogue, although the absolute value is not so large (approximately 0.1). Reaction products and intermediates produced by the 266 nm light photolysis have been studied, and it has been confirmed that 9-methyl- and 9-phenyl-9-silaphenanthrenes have been photochemically formed in methylcyclohexane at 77 K, in addition to the formation of radical cations of 9,10-dihydro-9-silaphenanthrene derivatives and the carbon-centered radical 9-hydro-9-silaphenanthrenyl radical.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phenanthrenes
/
Organosilicon Compounds
Language:
En
Journal:
J Phys Chem A
Journal subject:
QUIMICA
Year:
2006
Document type:
Article