Coherent and incoherent hopping of triplet exciton in quinoxaline-annelated and naphthalene-annelated dimers
摘要
Both a quinoxaline-annelated dimer and a naphthalene-annelated dimer showed excimer-type fluorescence spectra. Excimer-type phosphorescence was observed for the quinoxaline dimer, while the phosphorescence of the naphthalene dimer was not much different from that of the monomer type. In contrast, the EPR spectra clearly showed delocalization of the unpaired spins in the two chromophores for both molecules. The present results can be interpreted by the models of coherent supermolecule delocalization of the unpaired spins and incoherent hopping of triplet exciton for the quinoxaline and naphthalene dimers, respectively.