Photoresponsive Crown Ethers. 12. Photocontrol of Metal Ion Complexation with Thiacrown Ethers

S Shinkai, Y Honda, K Ueda, O Manabe

Index: Shinkai, Seiji; Honda, Yoshihiro; Ueda, Kaori; Manabe, Osamu Bulletin of the Chemical Society of Japan, 1984 , vol. 57, # 8 p. 2144 - 2149

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Abstract

Thiacrown ethers with a photofunctional azolinkage were synthesized to control their binding ability by an on-off light switch: They are the N 2 S 4 crowns capped with 2, 2′- azopyridine (1) or azobenzene (2). The cis-trans isomerism occurred reversibly by photoirradiation. The binding ability, evaluated by solvent extraction, showed that (i) the order of the affinity for Hg 2+ is N, N′-dibenzoylated N 2 S 4 crown (4)≈ photoirradiated ...