Rapid-scan time-resolved FT-IR spectroelectrochemistry - Studyon the electron transfer of ferrocene-substituted thiophenes

摘要

A series of ferrocene-substituted thiophenes, 2-ferrocenylthiophene, 2,5-diferrocenylthiophene and2,3,5-triferrocenylthiophene have been synthesized. The electron transfer mechanism during redox pro-cess of the ferrocenyl complexes was studied by cyclic voltammetry (CV), differential pulse voltammetry(DPV) and rapid-scan time-resolved FT-IR spectroelectrochemistry (RS-TRS FT-IR). Electrochemistry andRS-TRS FT-IR spectroelectrochemistry results indicated the redox process of 2,5-diferrocenylthiopheneand 2,3,5-triferrocenylthiophene involved two and three consecutive one-electron steps, respectively.IR absorption peaks arisen from intermediate appearing and disappearing on the experimental time scalein the oxidation and reduction process of 2,5-diferrocenylthiophene and 2,3,5-triferrocenylthiophenewere clearly observed by the RS-TRS FT-IR spectroelectrochemistry. A kinetics simulation experiment,based on the results of RS-TRS ET-IR spectroelectrochemistry, was conducted to give the kinetics param-eters of 2,5-diferrocenylthiophene.