کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
180211 459374 2011 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Facile cathodic surfacial carboxylation of glassy carbon by means of immobilized alkanoic acids chains
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Facile cathodic surfacial carboxylation of glassy carbon by means of immobilized alkanoic acids chains
چکیده انگلیسی

The reduction of ω-bromoalkanoic acids Br(CH2)nCOOH at glassy carbon cathodes in aprotic polar solvents (acetonitrile, N,N-dimethylformamide or propylene carbonate) in the presence of tetraalkylammonium salts at E < − 1.7 V vs. Ag/AgCl results in a dense organic layer, covalently attached to carbon, which progressively covers the electrode surface. It was evidenced that the immobilization of alkyl chains occurs via the scission of C-Br bonds permitting an efficient coverage of the carbon surface with the layers built of alkyl links [CH2]n (3 ≤ n ≤ 11) terminated with COOH groups. The carboxyls immobilized this way were easily transformed into electroactive esters or into amides by reacting with phenols or amines, respectively. Thus grafted π-acceptor groups allowed estimating the carboxylation level as very high, ca. (1–5) × 10− 9 mol/cm2 when taking into account the starting surface area. In aqueous media, the immobilized films with long alkyl linkers visibly behave as hydrophobic layers.

Figure optionsDownload as PowerPoint slideHighlights
► Efficient grafting of ω-bromoalkanoic acids at carbon surfaces
► Immobilization of long chain alkanoic acids forming compact layers
► Carbon carboxylation permitting surfaces functionalization
► Extension to macro-modification of industrial coke powders for catalysis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 13, Issue 12, December 2011, Pages 1296–1299
نویسندگان
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