Journal of Physical Chemistry & Biophysics
Open Access

Abstract

Further Studies on Relaxed and Un-Relaxed Exciplexes in Pyrene-N,NDimethylaniline System in Benzene-Acetonitrile Binary Solvents

Amit Kumar Jana, Partha Roy, Sanghita Mondal, Subrata Das and Deb Narayan Nath

Magnetic field effect (MFE) on pyrene-N,N-dimethylaniline (Py-DMA) exciplex system in benzene-acetonitrile (Bz-ACN) mixtures of varying bulk permittivity (ε) has been studied. The MFE has been wavelength resolved over the emission band of the exciplex along with the measurement of lifetime. The data establishes the concept of formation of two types of exciplexes (Relaxed and Un-relaxed) at higher bulk value of permittivity. At lower value of permittivity when solvent reorganization energy is not so prominent effectively only a single type of exciplex (Relaxed) is formed. The data also indicates that the benzene π cloud favors formation of relaxed exciplex.