Interactions Between Hydrated Cerium(III) Cations and Carboxylates in an Aqueous Solution: Anomalously Strong Complex Formation with Diglycolate, Suggesting a Chelate Effect.

ABSTRACT: Interactions between hydrated Ce³⁺ and various carboxylates are of fundamental interest. Anomalously strong interactions with Ce³⁺ occur when diglycolic acid (DGA) is added into a Ce³⁺ aqueous solution, unlike various other carboxylic acids. Herein, the complex-formation constants of Ce³⁺ with these acids are evaluated via absorption and emission spectra. Hydrated Ce³⁺ emits fluorescence with unity quantum yield; however, addition of various carboxylates statically quenches the fluorescence when Ce³⁺-carboxylate complexes form because the fluorescence lifetime is constant irrespective of the carboxylate concentration. In the observed static quenching, the complex-formation constants obtained from the absorption and emission

SUBMITTER: Oh-E M 

PROVIDER: S-EPMC7745448 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature