Coadsorption of ferrocene-terminated and unsubstituted alkanethiols on gold: Electroactive self-assembled monolayers

Journal Article · Wed May 23 00:00:00 EDT 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00167a028· OSTI ID:6659686

Chidsey, C E.D.; Bertozzi, C R; Putvinski, T M; Mujsce, A M ^[1]

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1. AT T Bell Laboratories, Murray Hill, NJ (USA)

Self-assembled monolayers provide an ideal system for disentangling the fundamental events in interfacial electron transfer. Coadsorption of ferrocene-terminated alkanethiols with unsubstituted n-alkanethiols on evaporated gold films yields stable, electroactive self-assembled monolayers. Monolayers containing low concentrations of alkanethiols linked to ferrocene by a polar ester group (FcCO{sub 2}(CH{sub 2}){sub n}SH, Fc = ({eta}{sup 5}-C{sub 5}H{sub 5})Fe({eta}{sup 5}-C{sub 5}H{sub 4})) show thermodynamically ideal surface electrochemistry in 1 M HClO{sub 4}, indicating the ferrocene groups to be homogeneous and noninteracting. Higher surface concentrations or use of alkanethiols linked directly to the nonpolar ferrocene group (Fc(CH{sub 2}){sub n}SH) lead to broadened electrochemical features, indicating interactions among ferrocene groups or inhomogeneous sites. Longer chain lengths and lower ferrocene surface concentrations result in slower electron-transfer kinetics with the ferrocene groups. A fraction of the thiols in a monolayer exchange with thiols in an ethanol solution, but much of the monolayer remains unequilibrated after 10 days.

• OSTI ID: 6659686
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:11; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
ADSORPTION
CHEMISTRY
DATA
DATA ANALYSIS
ELECTROCHEMISTRY
ELECTRON TRANSFER
ELEMENTS
EXPERIMENTAL DATA
GOLD
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
SORPTION
THIOLS
TRANSITION ELEMENTS