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Functionalization of Glassy Carbon With Diazonium Salts in Ionic Liquids

Functionalization of Glassy Carbon With Diazonium Salts in Ionic Liquids

Paolo Actis, Guilain Caulliez, Galyna Shul, Marcin Opallo, Michel Mermoux, Bernadette Marcus, Rabah Boukherroub, Sabine Szunerits

Langmuir. 2008 Jun 17;24(12):6327-33.

PMID: 18476667

Abstract:

The paper reports on the chemical functionalization of glassy carbon electrodes with 4-bromobenzene (4-BBDT) and 4-(4'-nitrophenylazo)benzene diazonium tetrafluoroborate (4-NAB) salts in ionic liquids. The reaction was carried out at room temperature in air without any external electrical bias in either hydrophobic (1-butyl-3-methylimidazolium hexafluorophosphate) or hydrophilic (1-butyl-3-methylimidazolium methyl sulfate) ionic liquids. The resulting surfaces were characterized using X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and electrochemical measurements. Electrochemical reduction of the terminal nitro groups allowed the determination of surface coverage and formation of an amine-terminated carbon surfaces. The results were compared to glassy carbon chemically modified in an aqueous solution in the presence of 1% sodium dodecyl sulfate (SDS) with the same diazonium salt. Furthermore, Raman spectroscopy coupled with electrochemical measurements allowed to distinguish between the reduction of -NO2 to -NH2 group and the -N=N- to -NH-NH- bond.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP401788985	1-Butyl-3-methylimidazolium methyl sulfate		401788-98-5	Price

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