Tetrahedron Letters

Bimodal fluorescence signaling based on control of the excited-state conformational twisting and the ground-state protonation processes

JS Yang, CY Hwang, MY Chen

Index: Yang, Jye-Shane; Hwang, Chung-Yu; Chen, Mon-Yao Tetrahedron Letters, 2007 , vol. 48, # 17 p. 3097 - 3102

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Citation Number: 17

Abstract

Amino-based fluoroionophores 1 and 2 can selectively sense alkaline earth metal ions in MeCN under both neutral and acidic conditions by different signaling mechanisms. The fluoroionophoric behavior for the neutral probes is characterized by an 'off–on'photoinduced electron transfer (PET)-like fluorescence intensity response due to a switching from a twisted internal charge transfer (TICT) to a planar internal charge transfer (PICT) state. For the ...