Photocontrol of Alkali Metal Ion Permeability through the PoIy(vinyl chloride)/Crown Ether Membranes

Jun Ichi Anzai, Hiroshi Sasaki, Kiyomi Shimokawa, Akihiko Ueno, Tetsuo Osa

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10 Citations (Scopus)


Investigations were carried out on the effect of photoirradiation on the alkali metal ion permeability of poly (vinyl chloride) (PVC) membranes entrapping photoresponsive crown ethers (3, 4-(l, 4, 7,10,13-pentaoxatridecane-l, 13-diyl)benzyl(phenylazo)benzoate [ 1 ] and 4, 4'-bis [3,4-(l,4,7,10,13-pentaoxatridecane-l,13-diyl)benzyloxycarbonyl]azobenzene [i]). The photo-responsive crown ethers [I] and [2] were isomerized from trans-form to cis-form and vice versa in the PVC membranes by ultraviolet (UV) and visible (VIS) light irradiation, respectively (Figures 2 and 3). The WC\trans-[2] membrane was found to permeate alkali metal picrates with the selectivity in order of K+ > Rb+ > Na+ > Cs+ (Tables 4 and 5). The permeation rate of K+ was accelerated by UV irradiation, while the acceleration for the other cations was not pronounced. The acceleration of K+ permeation rate was explicated in terms of enhancement of the K+ concentration in the membrane. On the other hand, in the case of the PVC/C[1] membrane, photoirradiation had little influence on the permeability for alkali metal-ions (Table 3). In order to estimate the cation-binding abilities of [ 1 ] and [2] the liquid-liquid extractions were carried out before and after irradiation (Tables 1 and 2). The K+ selectivities in extraction (K+/NaS) of 1.7 and 2.2 were observed for trans-[2] and UV-irradiated [2], respectively. The cation binding ability of [1] was not affected by UV irradiation. These results suggest that cis-[2] effectively binds K+ ion as an intramolecular sandwich-type complex.

Original languageEnglish
Pages (from-to)338-344
Number of pages7
Issue number2
Publication statusPublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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