1482-91-3Relevant articles and documents
Electronic Energy Levels in a Homologous Series of Unsubstituted Linear Polyenes
D'Amico, Kevin L.,Manos, Christopher,Christensen, Ronald L.
, p. 1777 - 1782 (1980)
Absorption, emission, and exitation spectra of 1,3,5,7-octatetraene, 1,3,5,7,9-decapentaene, and 1,3,5,7,9,11-dodecahexaene have been obtained in room temperature solutions and 77 K glasses.All spectra exibit the chracteristic gap between the origin of the strongly allowed absorption (1Ag --> 1Bu) and the origin of fluorescence (1Ag* --> 1Ag).Comparison with results previously obtained for methyl-substituted polyenes shows that the 1Bu-1Ag* energy gap is a sensitive function of the degree of substitution.Solvent-effects studies have been used to extrapolate transition energies of the unsubstituted polyenes to gas-phase conditions.For the tetraene, pentaene, and hexaene the 1Bu-1Ag* energy differences are 6380, 7050, and 7420 cm-1, respectively.These results are discussed in terms of current theoretical descriptions of polyene electronic states.
