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Indexed by:期刊论文

Date of Publication:2007-11-07

Journal:ORGANIC & BIOMOLECULAR CHEMISTRY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:5

Issue:21

Page Number:3535-3538

ISSN No.:1477-0520

Abstract:A new clip-like receptor, which comprises two thiourea-based binding groups and two naphthalene units, has been designed and synthesized as fluorescent chemosensor for distinguishing o-phthalate from two other isomers of dicarboxylates. Upon the addition of these three ions, the emission intensity at 420 nm ( excitation at 340 nm) decreases drastically through PET. When excited at 380 nm, a new emission band at 460 nm appears and develops gradually upon the addition of the o-phthalate ion and the fluorescent intensity increases markedly over time, but the presence of m-phthalate or p-phthalate do not cause this kind of change. It suggests a guest-induced "off-on" conformational switching signaling transduction. The presence of the o-phthalate anion induces a special conformation with two naphthalene units positioned close enough to exhibit a new emission.