Monolayers of the photosensitive benzodithia-15-crown-5 derivative

The amphiphilic benzodithia-15-crown-5 styryl dye forms relatively stable i nsoluble monolayers on distilled water (collapse pressure is 34.5 mN m(-1)) and alkali metal cations (35.6-36.7 mN m(-1)) or heavy metal cations (24.2 mN m(-1) for Ag+) in the aqueous subphase. Three types of the dye monolaye r structures depending on the subphase nature (water, alkali metal or heavy metal cations) have been distinguished from surface pressure-molecular are a and surface potential-molecular area isotherms, as well as observed by Br ewster angle microscopy (BAM). The ionoselective and photosensitive propert ies of the amphiphilic dye in monolayers have been studied in the presence of K+, Na+, Hg2+ and Ag+ cations in the aqueous subphases. (C) 2000 Elsevie r Science B.V. All rights reserved.