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dc.contributor.authorHo, I-Tingen_US
dc.contributor.authorHaung, Kuan-Changen_US
dc.contributor.authorChung, Wen-Shengen_US
dc.date.accessioned2014-12-08T15:20:43Z-
dc.date.available2014-12-08T15:20:43Z-
dc.date.issued2011-10-04en_US
dc.identifier.issn1861-4728en_US
dc.identifier.urihttp://dx.doi.org/10.1002/asia.201100023en_US
dc.identifier.urihttp://hdl.handle.net/11536/14747-
dc.description.abstractA novel 1,3-alternate calix[4]arene L, containing two different cationic binding sites of bis-triazoles and bis-enaminone groups, was synthesized and shown to be a homobinuclear ditopic fluorescent chemosensor for Ag(+) ions. The fluorescence intensity of L was selectively enhanced by binding with Ag(+) ions in methanol/chloroform (49:1, v/v) cosolvent. In the presence of most competing metal ions, L retains its selectivity toward Ag(+) ion. The binding constants K(1) and K(2) of the successive complexation of L with the first and second Ag(+) ions were calculated to be 4.46 x 10(3) and 9.20 x 10(4)M(-1), respectively. The higher K(2) value revealed that a positive allosteric effect participated in the complexation of L with the second equivalent of Ag(+). Based on (1)H NMR titration results, we inferred that the two distal bis-enaminone and bis-triazole groups on L cooperatively coordinated to Ag(+) ions with the help of cation-pi interactions from the phenoxy rings. Furthermore, the ESI-MS spectrometry clearly proved the formation of the homobinuclear complex L center dot(Ag(+))(2), because a base peak at m/z of 750.1701 was detected and its isotope pattern was in excellent agreement with the calculated one.en_US
dc.language.isoen_USen_US
dc.title1,3-Alternate Calix[4]arene as a Homobinuclear Ditopic Fluorescent Chemosensor for Ag(+) Ionsen_US
dc.typeArticleen_US
dc.identifier.doi10.1002/asia.201100023en_US
dc.identifier.journalCHEMISTRY-AN ASIAN JOURNALen_US
dc.citation.volume6en_US
dc.citation.issue10en_US
dc.citation.spage2738en_US
dc.citation.epage2746en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
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