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Accession number;99A0228198
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| Title;Allosteric Regulation of Ion Recognition by Formation of Pseudocryptand. |
| Author;
NABESHIMA TATSUYA
(Univ. of Tsukuba)
YOSHIHIRA YUKO
(Univ. of Tsukuba)
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Journal Title;Abstracts. Symposium on Biofunctional Chemistry
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Journal Code:L0836A
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ISSN:
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VOL.13th;NO.;PAGE.28-30(1998)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;We have prepared a new podand bearing three polyether chains which have a 2,2'-bipyridine moiety at each terminal. The host binds an Fe(II) ion quantitatively to give a red complex. Spectral data of the complex indicate that the bipyridine-Fe(II) complex has octahedral geometry. The 1:1 stoichiometry was ascertained by 1H NMR and UV-VIS titrations and mass spectroscopies. Upon the complexation, the three polyether moieties are considered to be assembled in a fashion similar to that of cryptand. The novel host shows interesting allosteric effects on transport of alkali metal ion through a liquid membrane. In the presence of Fe(II) all the host is converted to the corresponding octahedral Fe(II) complex, pseudocryptand, which exhibits much higher transport ability toward Cs+ than the free host. In contrast, the allosteric effect is inverse in the case of K+. (author abst.) |
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