Journal
TETRAHEDRON LETTERS
Volume 50, Issue 6, Pages 671-675Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.11.090
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Funding
- Korea Science and Engineering Foundation [R01-2007-000-20245-0]
- National Research Foundation of Korea [R01-2007-000-20245-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Synthesis, photophysical, and complexation properties of fluorescent chemosensors, L-1 and L-2, with 'receptor-spacer-fluorophore' motif (L-1: NS2O2-cyclic receptor, L-2 : acyclic analogue receptor) are described. Maximum chelation-enhanced fluorescence effect (TURN-ON type) was observed in the presence of Ag+ for both fluoroionophores in a 1:1 (v/v) aqueous ethanol solution: remarkably superior selectivity of L-1 (150-fold) with cyclic receptor than that of the L-2 (50-fold) with acyclic analogue was found. According to the fluorescence and NMR titrations, the excellent selectivity of L-1 is attributed to its topology-based higher affinity in complexation. (C) 2008 Elsevier Ltd. All rights reserved.
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