C₃-Functionalized Cyclotriveratrylene Derivative Bearing Quinolinyl Group as a Fluorescent Probe for Cu²⁺

Abstract

A new C₃-functionalized cyclotriveratrylene (CTV) bearing three fluorogenic quinolinyl groups was synthesized and studied as a fluorescent probe. The CTV derivative exhibited a selective response of fluorescence enhancement toward Cu²⁺. The fluorescence intensity in CH₃CN was increased until the [Cu²⁺]/[CTV derivative] mole ratio was 3. Moreover, C₃-functionalized CTV(2-quinolinemethyl)₃ was applied to a visible fluorescent probe by using a plasticized polymeric membrane. The emission profile was observed by a fluorescence microscope after immersing the membrane in a 1 × 10^-5 M aqueous solution of Cu²⁺.