Cesium Cation Complexation by a Flavin Receptor via Self-Assembly and Deprotonation

This study focuses on the self-assembly
of a new flavin compound
and its scaffolding function for a Cs+ ion. 7,8-Dimethyl-10-[4′-(methoxycarbonyl)­phenyl]-isoalloxazine
(FlH–MB) displays self-assembly in a DMSO solution and has
strong dependence on the solvent. In the DMSO solution, both the resulting
scaffold and the deprotonation of FlH–MB were demonstrated
to induce complex formation with a Cs+ ion, which was investigated
by UV–vis, 1H NMR, and fluorescence titrations.
This complex formation involves both Coulombic and cation−π
interactions through the Fl– site in an Fl––MB dimer.