TRANSPORT CHARACTERISTICS OF THE PHOTO-DRIVEN ACTIVE-TRANSPORT BY TRIARYL CATIONS ACROSS A LIQUID MEMBRANE

In order to understand the photo-driven active transport of anions med iated by triaryl cations across an organic liquid membrane, the photoc hromic properties of the carrier and the interfacial processes were ex amined. When p-toluenesulfonate was used as a substrate, practically n o active transport was observed with bis -(di-n-butylamino)phenyl]-4'- methylphenylmethanol, which was ascribed to the slow release of anions into the receiving phase. The use of the more hydrophilic bromide as the substrate greatly increased the rate of transfer into the receivin g phase, resulting in an efficient photo-driven active transport of br omide. Use of the more reactive carrier 9 s[4-(di-n-butylamino)phenyl] -10-methylacridin-9-ol also accelerated the rate-limiting release of p -toluenesulfonate, and efficient photo-driven active transport was ach ieved. The results indicated that photo-driven active transport is tun able by selection of the hydrophilic anions and/or by controlling the stability of the triaryl cations.