Fluorescence-based Measurement of the Lewis Acidities of Lanthanide Triflates in Solution

29 April 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Despite the prominence of rare earth complexes to act as Lewis-acid catalysts in organic synthesis, the comprehensive measure of the Lewis-acid strength of such compounds has yet to be performed due to incompatibilities with existing methods. We report our results in measurement of a sequence of lanthanide triflates via our recently established Fluorescent Lewis adduct (FLA) method. The persistence in solution of these Lewis acids as solvated coordination complexes is accurately measurable by the FLA method. However, several of the RE species exhibit fluorescence quenching, which may potentially inhibit the measurement. Nevertheless, meaningful FLA measurements were still able and the results correspond to both periodic trends and were even consistent with previous correlated reported data

Keywords

Lewis acids
lanthanides
fluorescence
dithienophosphole
catalysis

Supplementary materials

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