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Spectrofluorimetric flow-injection determination of tertiary amines in non-aqueous media

Elsevier B.V.
Publication Date
DOI: 10.1016/s0003-2670(00)85689-5


Abstract The cyclic condensation of malonic acid with acetic anhydride in non-aqueous media is catalyzed selectively by tertiary amines. This derivatization reaction is adapted for flow injection analysis. A reaction pathway for the cyclization of a mixed anhydride condensate to form a fluorescent fully acylated phloroglucinol carboxylic acid is proposed. The effects of reaction parameters on the sensitivity of the reactionare described and calibration data are presented for ⩽2.7 mM triethylamine, tripentylamine, N,N-diethylaniline and pyridine. A secondary amine (diethylamine) gave a negligible response, but both primary and secondary amines partially quenched the fluorescence induced by a tertiary amine.

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