The dimethylpolyene deca-2,4,6,8-tetraene was studied by absorption, fluorescence excitation and fluorescence spectroscopy in glasses at 77 K and in n-alkane crystals at 4.2 K. A strong transition to a 1Bu excited state is observed with an origin at 32400 cm-1 in isopentane at 77 K and at 31280 cm-1 in n-undecane at 4.2 K. A weak transition to a 1Ag excited state is observed with an origin at 28738 cm-1 in the n-undecane matrix. The radiative fluorescence lifetime is 500 ns. In undecane the transition from the ground state to the 1Ag excited state exhibits a classic Herzberg-Teller vibronic pattern indicating a symmetry forbidden transition.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry