TEMPERATURE-DEPENDENT DUAL LUMINESCENCE OF LOROMETHYLENO)-(9'H)-10,10'-DIHYDRO-9,9'-BIANTHRYL (CDDB) AND ITS EXCITED-STATE DIPOLE-MOMENT

The temperature dependent dual fluorescence of 9-chloro-10, loromethyl eno)-(9'H)-10,10'-dihydro-9,9'-bianthryl (CDDB) is reported. Both radi ative and non-radiative rate constants are temperature dependent. The dependence of the radiative rate constant on temperature is explained. The dipole moment of the TICT state of CDDB has been measured by the thermochromic shift of emission spectra in some homologous solvents ra nging from methanol to butanol. The excited state dipole moment calcul ated from the thermochromic shift agrees well with that derived by oth er methods.