SALT EFFECTS ON A PROTON-TRANSFER REACTION OF EXCITED 1-NAPHTHOL IN ASOLID LIQUID INTERFACE LAYER - A PICOSECOND TIME-RESOLVED TOTAL INTERNAL-REFLECTION FLUORESCENCE STUDY/

Analyses of the excited-state proton transfer reaction of 1-naphthol i n sapphire/water interface layers have been performed using fluorescen ce decay data obtained by a picosecond time-resolved total internal re flection fluorescence spectroscopy. The rate constant of the excited-s tate proton transfer reaction, k(1), of 1-naphthol in an interface lay er was reduced as compared to that in a bulk aqueous solution. Additio n of NaCl to aqueous solution of 1-naphthol resulted in a decrease in k(1) for both in the interface layer and in the bulk solution, suggest ing that a proton acceptor from excited 1-naphthol is not a single wat er molecule but a water cluster and that water clusters in an interfac e layer are also destroyed by NaCl.