ANISOTROPY OF DUAL FLUORESCENCE OF 2,3-DIAZABICYCLO(2.2.2)OCT-2-ENE AND 1,4-DIMETHYL-(2,3-DIAZABICYCLO(2.2.2)OCT-2-ENE)

UDC 535.37+535.4 Absorption, fl uorescence excitation, and fl uorescence spectra and the fl uorescence polarization as a function of emission wavelength were measured at 77 K for glassy EtOH solutions of 2,3-diazabicyclo[2.2.2]oct-2-ene and 1,4-dimethyl-(2,3-diazabicyclo[2.2.2]oct-2-ene). It was concluded from an analysis of the results that two excited electronic states were responsible for the emission of these compounds. The transition dipole moment vectors from the ground state into the excited ones were mutually perpendicular so that the corresponding spectra were shifted.