Site-selective cation–π interaction as a way of selective recognition of the caesium cation using sumanene-functionalized ferrocenes

Abstract

The first sumanene–ferrocene probes for efficient and selective caesium cation (Cs⁺) recognition are reported. The working mechanism of the sumanene moiety as the sensing unit was based on the site-selective cation–π interaction in its neutral state. The interactions with Cs⁺ were characterized by high association constant values together with low limits of detection.