PHOTOCHEMISTRY IN MICROEMULSIONS - FLUORESCENCE QUENCHING OF NAPHTHOLS AND THEIR O-ALKYL DERIVATIVES BY CCL4

The fluorescence characteristics of 1- and 2-naphthols and their O-alk yl derivatives in presence of carbon tetrachloride have been studied i n hexane and in sodium lauryl sulphate (NaLS)-isobutanol-hexane-water microemulsions. The fluorescence quenching of the fluorophore by CCl4 obeys the linear Stern-Volmer equation in most of the cases except in oil-in-water microemulsion. A quenching sphere of action model has bee n proposed for the deviation and the number of quenchers present in th e quenching sphere of action has been calculated. The dielectric const ant of the water-in-oil and oil-in-water microemulsion surface has bee n evaluated to be 27.36 and 34.31, respectively.