Anodic Oxidation of Ethynylferrocene Derivatives in Homogeneous Solution and Following Anodic Deposition onto Glassy Carbon Electrodes

Matthew V. Sheridan, Kevin Lam, Rory Waterman, William E. Geiger

Research output: Contribution to journalArticlepeer-review

Abstract

Eight ferrocene derivatives linked by either an ether, amine, or phenylacetylene moiety to a terminal ethynyl group were covalently deposited on glassy carbon electrodes by anodic electrochemical methods. The lithio activation method, in which the terminal hydrogen of the ethynyl group is replaced by a lithium atom before anodic oxidation, was successfully employed in all cases. Direct oxidation of the inactivated ethynyl group also resulted in surface deposition. Surface coverages between 1×10−10 mol cm−2 and 14×10−10 mol cm−2 were achieved. Cyclic voltammetry scans of the modified electrodes in pure electrolytes differed depending on the size of the supporting electrolyte anion, as little as half the current being measured for a [B(C6F5)4] vs. [PF6] solution, suggesting differences in ion transport near the electrode surface. An ether-linked ethynylferrocenium ion (5+) was isolated after electrolytic and chemical oxidation of 5 and characterized by X-Ray crystallography as its [SbCl6] salt.

Original languageEnglish
Pages (from-to)5880-5887
Number of pages8
JournalChemElectroChem
Volume6
Issue number23
DOIs
Publication statusPublished - Dec 2 2019

Keywords

  • electrochemical deposition
  • electrolytes
  • ethynyl group
  • ferrocene
  • large anions

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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