Is the iron center important? Comparison of the electrochemistry between poly-phen-NH2 and poly[Fe(phen-NH2)32+] modified electrodes

Ting Chuang Wan, Hao Wang Ching, Chong Mou Wang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

5-Amino-1,10-phenanthroline (denoted phen-NH2) and its iron(II) complex, Fe(phen-NH2)32+, were prepared as polymer modified electrodes for electrochemical studies. According to the cyclic voltammograms and in situ electrochemical quartz-crystal-microbalance spectra (EQCM) recorded for Fe(phen-NH2)32+, phen-NH2 and 1,10-phenanthroline (denoted phen), Fe(phen-NH2)32+ can be immobilized on the Pt-sputtered crystal electrode via an anodic polymerization. This polymerization is likely to be initiated by the oxidation of the amino group in the ligand. Although phen-NH2 can also be polymerized on the electrode surface, the resulting polymer film is less stable compared with its iron derivative. The poly[Fe(phen-NH2)32+] electrode showed a significant sensitivity to hydrogen peroxide, leading to a linear calibration curve up to 10 mM at pH 5. The detection limits reached a level of 10 μM. The rate constant (pseudo-first-order) of the reaction between the reduced poly[Fe(phen-NH2)32+] and H2O2 was determined to be 470 M-1 s-1 at this pH. Due to this catalytic property, a glucose sensor was developed. Although experiments suggested that some catalytic sites in the polymer film might be buried by the bulky enzyme (GOx), this modified electrode showed a significant ability in the detection of glucose. The linear sensitivity covered a range of 0.1-60 mM at pH 5. The detection limits reached a level of 0.1 mM.

Original languageEnglish
Pages (from-to)175-182
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume521
Issue number1-2
DOIs
Publication statusPublished - 2002 Mar 8

Fingerprint

Electrochemistry
Iron
Electrodes
Polymer films
Polymerization
Glucose sensors
Quartz crystal microbalances
Hydrogen peroxide
Hydrogen Peroxide
Glucose
Rate constants
Polymers
Enzymes
Ligands
Calibration
Derivatives
Oxidation
Crystals
Experiments
1,10-phenanthroline

Keywords

  • Chemically modified electrode
  • Fe(phen-NH)
  • Glucose
  • Hydrogen peroxide

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Is the iron center important? Comparison of the electrochemistry between poly-phen-NH2 and poly[Fe(phen-NH2)32+] modified electrodes. / Wan, Ting Chuang; Ching, Hao Wang; Wang, Chong Mou.

In: Journal of Electroanalytical Chemistry, Vol. 521, No. 1-2, 08.03.2002, p. 175-182.

Research output: Contribution to journalArticle

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AB - 5-Amino-1,10-phenanthroline (denoted phen-NH2) and its iron(II) complex, Fe(phen-NH2)32+, were prepared as polymer modified electrodes for electrochemical studies. According to the cyclic voltammograms and in situ electrochemical quartz-crystal-microbalance spectra (EQCM) recorded for Fe(phen-NH2)32+, phen-NH2 and 1,10-phenanthroline (denoted phen), Fe(phen-NH2)32+ can be immobilized on the Pt-sputtered crystal electrode via an anodic polymerization. This polymerization is likely to be initiated by the oxidation of the amino group in the ligand. Although phen-NH2 can also be polymerized on the electrode surface, the resulting polymer film is less stable compared with its iron derivative. The poly[Fe(phen-NH2)32+] electrode showed a significant sensitivity to hydrogen peroxide, leading to a linear calibration curve up to 10 mM at pH 5. The detection limits reached a level of 10 μM. The rate constant (pseudo-first-order) of the reaction between the reduced poly[Fe(phen-NH2)32+] and H2O2 was determined to be 470 M-1 s-1 at this pH. Due to this catalytic property, a glucose sensor was developed. Although experiments suggested that some catalytic sites in the polymer film might be buried by the bulky enzyme (GOx), this modified electrode showed a significant ability in the detection of glucose. The linear sensitivity covered a range of 0.1-60 mM at pH 5. The detection limits reached a level of 0.1 mM.

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