Photocontrollable Cation Extraction with Crowned Oligo(spirobenzopyran)s

NAKAMURA Makoto, SAKAMOTO Hidefumi, KIMURA Keiichi

doi:10.2116/analsci.21.403

Photocontrollable Cation Extraction with Crowned Oligo(spirobenzopyran)s

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NAKAMURA Makoto

Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University
SAKAMOTO Hidefumi

Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University
KIMURA Keiichi

Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University

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抄録

The photoinduced changes of metal-ion extractability of crown ether derivatives bearing three or four spirobenzopyran moieties and their analogues were studied using 1,2-dichloroethane as the organic solvent. Under dark conditions, these compounds extracted Cu²⁺, Ag⁺, and Pb²⁺ with their counteranions from the aqueous phase to the organic phase. The extraction equilibrium constants of the photochromic crown ether derivatives for Cu²⁺ and Ag⁺ were determined successfully. Under UV-light irradiation conditions, the extraction of Cu²⁺ by crowned tris(spirobenzopyran) was enhanced, while that of Ag⁺ was suppressed. During the competitive metal-ion extraction of crowned oligo(spirobenzopyran)s between Cu²⁺ and Ag⁺, the metal-ion selectivity was reversed explicitly by photoirradiation.