A new ferrocenophane surface derivatizing reagent for the preparation of nearly reversible electrodes for horse heart ferri-/ferrocytochrome c: 2,3,4,5-tetramethyl-1-((dichlorosilyl)methyl((2)-ferrocenophane
Pt gauze electrodes functionalized with hydrolytically unstable 2,3,4,5-tetramethyl-1-((dichlorosilyl)methyl)(2)-ferrocenophane (I) exihibit persistent cyclic voltammetry waves consistent with a surface-confined redox couple, PMFc/sup +//PMFc/sup 0/, having an E/sup o'/ = +0.04 V vs. SCE in H/sub 2/O/1.0 M NaClO/sub 4/ at pH 7.0. Such electrodes will effect the one-electron reduction of horse heart ferricytochrome c (cyt c/sub ox/) to ferrocytochrome c (cyt c/sub red/ as well as the oxidation of cyt c/sub ox/, under conditions where the naked electrode does not effect such redox processes. n-type Si photoanodes functionalized with I will effect the uphill oxidation of cyt c/sub red/ upon greater than or equal to E/sub g/ illumination and will effect cyt c/sub ox/ reduction in the dark. Derivatized electrodes are durable and do not significantly lose activity with use; a 4.4mM cyt c solution can be alternately exhaustively oxidized and reduced at +0.3 or -0.3 V vs. SCE in controlled-potential electrolyses for > 10 cycles without electrode deterioration. Electrodes derivatized with I come into charge-transfer equilibrium with cyt c/sub ox//cyt c/sub red/, E/sup o'/ = +0.02 V vs. SCE, via heterogeneous electron-exchange processes involving the PMFc/sup +//PMFc/sup 0/ redox centers; such electrodes can be used as potentiometric sensors for cyt c.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge
- OSTI ID:
- 6164034
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 105:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CYTOCHROMES
REDOX PROCESS
ELECTRODES
CHEMICAL PREPARATION
IRON COMPLEXES
EXPERIMENTAL DATA
REDOX POTENTIAL
VOLTAMETRY
COMPLEXES
DATA
INFORMATION
NUMERICAL DATA
PIGMENTS
REPROCESSING
SEPARATION PROCESSES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400400* - Electrochemistry