Highly selective recognition of fluoride using a trapezoidal cage

Abstract

By using a trapezoidal cage (1), highly selective recognition of F⁻ (S > 1000) was achieved in highly competitive environments composed of a large excess of various common anions. Through NMR, fluorescence, UV-vis and HRMS studies, the binding behavior and binding affinity (β₂ = ∼10⁷ M⁻²) of 1 + F⁻ are shown.