Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/74533
Type: Artigo de periódico
Title: STANDARD MOLAR ENTHALPIES OF FORMATION OF SOME CRYSTALLINE AMINE N-OXIDES
Author: AIROLDI, C
GONCALVES, LJ
Abstract: Based on the fact that N-oxide groups are kinetically reduced by titanium solution, a general thermochemical reaction, 3LO(c) + KX(c) = KXO3(c) + 3L(l); DELTA(r)H(m)-degrees (LO = N-oxide compound, L = amine, X = Cl, Br), was employed to determine through solution-reaction calorimetry the standard molar enthalpies of formation of crystalline ortho-, meta- and para-methylpyridine N-oxides, as well as those of triethyl- and tri-n-butylamine N-oxides, giving 10.3 +/- 0.8, 8.8 +/- 0.7, 12.9 +/- 0.9, 9.0 +/- 0.8 and 16.0 +/- 1.1 kJ mol-1, respectively. The advantage of this method is that it avoids combustion calorimetry in which it is difficult for this kind of substance to achieve complete combustion.
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/0040-6031(92)80025-R
Date Issue: 1992
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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