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Singlet-triplet transitions conjugated hydrocarbons

Biphenylene and trisdehydro[12]annulene are representatives of conjugated hydrocarbons with a 4 -membered ring. The pattern of their absorption spectra is completely different from that of benzenoid aromatics. Their HOMO and LUMO are derived from the two NBMOs of an ideal perimeter and both the lowest excited singlet and triplet state can be described by the configuration A ho lu- The transition is symmetry forbidden in molecules of D2h symmetry or higher. Nonradiative decay usually dominates their photophysical properties. Quantum yields of fluorescence and intersystem crossing are low.307 The LCAO version of Platt s perimeter model has been extended to treat conjugated systems with AN jt-electrons derived from [ ]annulenes.308,309... [Pg.170]

See other pages where Singlet-triplet transitions conjugated hydrocarbons is mentioned: [Pg.124]    [Pg.273]    [Pg.162]    [Pg.2]    [Pg.190]    [Pg.61]    [Pg.45]    [Pg.443]    [Pg.36]    [Pg.130]    [Pg.642]    [Pg.25]   
See also in sourсe #XX -- [ Pg.124 ]



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