FLUORESCENCE SPECTRA OF THE NOVEL COMPOUND 2‘–CHLORO–4–METHOXY–3–NITRO BENZIL AND 2,2‘–DICHLORO BENZIL AT ROOM TEMPERATURE IN DIFFERENT SOLVENTS

G.Nithya; Charles C.Kanakam; R.Sudha

Volume : V, Issue : III, March - 2015

FLUORESCENCE SPECTRA OF THE NOVEL COMPOUND 2‘–CHLORO–4–METHOXY–3–NITRO BENZIL AND 2,2‘–DICHLORO BENZIL AT ROOM TEMPERATURE IN DIFFERENT SOLVENTS

G. Nithya, Charles C. Kanakam, R. Sudha

Abstract :

Multiple emissions have been observed from 2’–chloro–4–methoxy–3–nitro benzil and 2,2’–dichloro benzil with polar and non polar solvents at room temperature. In non polar solvents, only trapped emission is observed whereas both excitonic and trapped fluorescence occur in polar aprotic solvents. The amount and wavelength of the emitted energy depend on both the fluorophore and the chemical environment of the fluorophore. The cis–skew to trans–planar photoisomerization of both the compounds 2’–chloro–4–methoxy–3–nitro benzil and 2,2’–dichloro benzil in the photoexcited state was in a series of normal solvents at room temperature. The solvent effects on the intramolecular charge transfer bands are discussed using the possible correlations (with advantages and disadvantages) between adsorption/fluorescence maxima and various solvent parameters. The intensity is found to exhibit variantly in different solvents. It is revealed that the compound exhibits different geometries in different solvents.