AI Article Synopsis
- The study investigates the photophysical and photochemical properties of specific silaphenanthrene derivatives at different temperatures, comparing them to a carbon version.
- These silaphenanthrene compounds exhibit lower fluorescence yields but significantly higher Stokes shifts compared to their carbon counterpart, while their phosphorescence yields are notably better.
- The photolysis at 266 nm produces various reaction products and intermediates, confirming that the silaphenanthrenes can form under these conditions, along with specific radical cations and radicals.
Article 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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