A spirobenzopyran derivative (1′-hexadecy1-3′,3′-dimethy1-6-nitrospiro[2H-1-benzopyran-2,2′-indolinen]) was immobilized into poly(vinyl chloride) membrane in order to study the photo-response of the membrane potential. UV light irradiation induced membrane potential changes of more than 100 mV with a response time of ca. 1 min. The photoinduced potential changes were larger in the lower ionic concentration region. Photo-response was also observed when no concentration gradient of electrolyte between the two solutions existed; this was explained based on the formation of asymmetric membrane under UV light irradiation. Photo-response of the membrane potential was enhanced in the slightly acidic region, suggesting an important role of the protonated form of opened spirobenzopyran in determining the membrane potential.
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Materials Science (miscellaneous)
- Environmental Science(all)
- Polymers and Plastics