A highly selective fluorescent chemosensor for silver(I) in water/ethanol mixture

作者：Park Chul Soon; Lee Jai Young; Kang Eun Ju; Lee Ji Eun; Lee Shim Sung^*

来源：Tetrahedron Letters, 2009, 50(6): 671-675.

DOI：10.1016/j.tetlet.2008.11.090

Synthesis, photophysical, and complexation properties of fluorescent chemosensors, L(1) and L(2), with 'receptor-spacer-fluorophore' motif (L(1): NS(2)O(2)-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.

• 出版日期2009-2-11