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Molecular energetics of alkyl substituted pyridine N-oxides

An experimental study

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Abstract

The standard (p° = 0.1 MPa) energies of combustion in oxygen, at T = 298.15 K, for the solid compounds 2-methylpyridine-N-oxide (2-MePyNO), 3-methylpyridine-N-oxide (3-MePyNO) and 3,5-dimethylpyridine-N-oxide (3,5-DMePyNO) were measured by static-bomb calorimetry, from which the respective standard molar enthalpies of formation in the condensed phase were derived. The standard molar enthalpies of sublimation, at the same temperature, were measured by Calvet microcalorimetry. From the standard molar enthalpy of formation in gaseous phase, the molar dissociation enthalpies of the N–O bonds were derived, and compared with values of the dissociation enthalpies of other N–O bonds available for other pyridine-N-oxide derivatives.

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Fig. 1
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Acknowledgements

Thanks are due to Fundação para a Ciência e Tecnologia (FCT), Lisbon, Portugal and to FEDER for financial support. J I.T.A.C. thanks FCT and the European Social Fund (ESF) under Community Support Framework (CSF) for the award of a Post-Doc research grant (BPD/27140/2006).

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Authors and Affiliations

  1. Centro de Investigação em Química, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal

    Joana I. T. A. Cabral, Ricardo A. R. Monteiro, Marisa A. A. Rocha, Luís M. N. B. F. Santos & Maria D. M. C. Ribeiro da Silva

  2. Department of Chemistry, University of North Texas, Denton, TX, 76203-5070, USA

    William E. Acree Jr.

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  1. Joana I. T. A. Cabral
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  2. Ricardo A. R. Monteiro
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  3. Marisa A. A. Rocha
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  5. William E. Acree Jr.
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  6. Maria D. M. C. Ribeiro da Silva
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Correspondence to Maria D. M. C. Ribeiro da Silva.

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Cabral, J.I.T.A., Monteiro, R.A.R., Rocha, M.A.A. et al. Molecular energetics of alkyl substituted pyridine N-oxides. J Therm Anal Calorim 100, 431–439 (2010). https://doi.org/10.1007/s10973-009-0646-7

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  • DOI: https://doi.org/10.1007/s10973-009-0646-7

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