Anodization in Oligo(Ethylene Glycol)as an Initial Derivatization Tool for Preparing Glassy Carbon Electrodes Covalently Medified with Amino Compounds : Effective Access to a 2, 2, 6, 6-Tetramethylpiperidinyl-1-oxyl(TEMPO)-Modified Glassy Carbon Electrode

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Anodization in HO(CH_2CH_2O)_nH(1a, n=2; 1b, n=3; 1c, n=4)as an initial derivatization tool for preparing glassy carbon(GC)electrodes covalently modified with amino compounds was explored. As an amino compound to be immobilized, 4-amino-2, 2, 6, 6-tetramethylpiperidinyl-1-oxyl(4-amino-TEMPO)was selected. When GC electrodes anodized at 2.0V vs. Ag wire coated with AgCl in 1 containing RCH_2CH_2SO_3Na(2a, R=H; 2b, R=OH)were treated with a N, N-dimethylformamide(DMF)or CH_2Cl_2 solution of 4-amino-TEMPO and 1, 3-dicyclohexylcarbodiimide(DCC), TEMPO-modified GC electrodes were afforded. Coverage(Γ_<TEMPO>)of the electrode surfaces by TEMPO was estimated by cyclic voltammetry in CH_3CN containing NaClO_4. A TEMPO-modified GC electrode with the best Γ_<TEMPO>(1.36×10^<-10>mol/cm^2)was obtained by anodization in 1b containing 2a at the expense of 3.0C followed by amidization in DMF for 7d. On cyclic voltammetry, the TEMPO-modified GC electrode showed good and stable electrocatalytic ability for oxidation of allyl alcohol in the presence of 2, 6-lutidine.
公益社団法人日本薬学会の論文
2001-10-01