Käch D, Gasser AC, Wettstein L, Schweinzer C, Bezdek M. Phosphine Oxide-Functionalized Terthiophene Redox Systems.
Angew Chem Int Ed Engl 2023:e202304600. [PMID:
37190956 DOI:
10.1002/anie.202304600]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/02/2023] [Accepted: 05/15/2023] [Indexed: 05/17/2023]
Abstract
Main group systems capable of undergoing controlled redox events at extreme potentials are elusive yet highly desirable for a range of organic electronics applications including use as energy storage media. Herein we describe phosphine oxide-functionalized terthiophenes that exhibit two reversible 1e- reduction at potentials below -2 V vs Fc/Fc+ (Fc = ferrocene) while retaining high degrees of stability. A phosphine oxide-functionalized terthiophene radical anion was synthesized in which the redox-responsive nature of the platform was established using combined structural, spectroscopic, and computational characterization. Straightforward structural modification led to the identification of a derivative that exhibits exceptional stability during bulk 2e- galvanostatic charge-discharge cycling and enabled characterization of a 2e- redox series. A new multi-electron redox system class is hence disclosed that expands the electrochemical cell potential range achievable with main group electrolytes without compromising stability.
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