THE ELECTRON DONOR-ACCEPTOR EXCIPLEX OF N,N-DIMETHYLANILINE AND 1,4,6-TRIMETHYLNAPHTHALENE

Exciplex fluorescence between N,N-dimethylaniline (DMA) and 1,4,6-trim ethylnaphthalene (1,4,6-TMN) in isooctane was studied at room and elev ated temperatures. This new exciplex, resulting from the association o f the DMA donor to the TMN acceptor, was characterized by steady-state and time-resolved emission fluorescence spectroscopy. Temperature-de pendent measurements of the exciplex fluorescence reveal that the quen ching mechanism leading to exciplex formation is sufficiently favorabl e to permit the exciplex to exist at temperatures approaching 150 degr ees C. These results presage the utility of the DMA-TMN system as a ne w and viable diagnostic for the visualization of the gas/liquid distri bution in flows.