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Enthalpies of formation of piperazinium dinitrate, C4H12N2(NO3)2, dichloride, C4H12N2Cl2, and dichloride monohydrate, C4H12N2Cl2·H2O.

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Title: Enthalpies of formation of piperazinium dinitrate, C4H12N2(NO3)2, dichloride, C4H12N2Cl2, and dichloride monohydrate, C4H12N2Cl2·H2O.
Authors: Tsvetkov, Dmitry S.1,2 (AUTHOR) Dmitry.Tsvetkov@urfu.ru, Mazurin, Maxim O.2 (AUTHOR), Malyshkin, Dmitry A.1,2 (AUTHOR), Sereda, Vladimir V.1,2 (AUTHOR), Ivanov, Ivan L.1,2 (AUTHOR), Zuev, Andrey Yu.2 (AUTHOR)
Source: Journal of Chemical Thermodynamics. Nov2022, Vol. 174, pN.PAG-N.PAG. 1p.
Subjects: Thermochemistry, Piperazine, Calorimetry, Combustion, Hydration, Ions
Abstract: • Standard formation enthalpies of piperazine salts: C 4 H 12 N 2 (NO 3) 2 , C 4 H 12 N 2 Cl 2 and C 4 H 12 N 2 Cl 2 ·H 2 O at 298.15 K were determined. • Hydration enthalpies of piperazinium dichloride by gaseous and liquid water were calculated. • Δ f H° 298 of aqueous C 4 H 12 N 2 2+ ion was estimated. Standard formation enthalpies of some solid piperazine salts: C 4 H 12 N 2 (NO 3) 2 , C 4 H 12 N 2 Cl 2 and C 4 H 12 N 2 Cl 2 ·H 2 O at 298.15 K were measured using combustion and solution calorimetry. The following values were obtained: Δ f H 298 ° (C 4 H 12 N 2 (NO 3) 2) = (-594.4 ± 2.7) kJ·mol−1, Δ f H 298 ° (C 4 H 12 N 2 Cl 2) = (-475.6 ± 2.9) kJ·mol−1, Δ f H 298 ° (C 4 H 12 N 2 Cl 2 ·H 2 O) = (-772.3 ± 2.9) kJ·mol−1 (expanded uncertainties, 95% confidence level). The hydration enthalpies of piperazinium dichloride by gaseous and liquid water were found to be equal to (-54.82 ± 0.09) kJ·mol−1(H 2 O) and (-10.83 ± 0.09) kJ·mol−1(H 2 O), respectively (expanded uncertainties, 95% confidence level). The results obtained allowed estimating Δ f H 298 ° of aqueous C 4 H 12 N 2 2+ ions as (-128.5 ± 2.9) kJ·mol−1 (expanded uncertainty, 95% confidence level), which is in good agreement with the value of (-129.0 ± 3.3) kJ·mol−1 (expanded uncertainty, 95% confidence level) that was calculated using the literature data. [ABSTRACT FROM AUTHOR]
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Abstract:• Standard formation enthalpies of piperazine salts: C 4 H 12 N 2 (NO 3) 2 , C 4 H 12 N 2 Cl 2 and C 4 H 12 N 2 Cl 2 ·H 2 O at 298.15 K were determined. • Hydration enthalpies of piperazinium dichloride by gaseous and liquid water were calculated. • Δ f H° 298 of aqueous C 4 H 12 N 2 2+ ion was estimated. Standard formation enthalpies of some solid piperazine salts: C 4 H 12 N 2 (NO 3) 2 , C 4 H 12 N 2 Cl 2 and C 4 H 12 N 2 Cl 2 ·H 2 O at 298.15 K were measured using combustion and solution calorimetry. The following values were obtained: Δ f H 298 ° (C 4 H 12 N 2 (NO 3) 2) = (-594.4 ± 2.7) kJ·mol−1, Δ f H 298 ° (C 4 H 12 N 2 Cl 2) = (-475.6 ± 2.9) kJ·mol−1, Δ f H 298 ° (C 4 H 12 N 2 Cl 2 ·H 2 O) = (-772.3 ± 2.9) kJ·mol−1 (expanded uncertainties, 95% confidence level). The hydration enthalpies of piperazinium dichloride by gaseous and liquid water were found to be equal to (-54.82 ± 0.09) kJ·mol−1(H 2 O) and (-10.83 ± 0.09) kJ·mol−1(H 2 O), respectively (expanded uncertainties, 95% confidence level). The results obtained allowed estimating Δ f H 298 ° of aqueous C 4 H 12 N 2 2+ ions as (-128.5 ± 2.9) kJ·mol−1 (expanded uncertainty, 95% confidence level), which is in good agreement with the value of (-129.0 ± 3.3) kJ·mol−1 (expanded uncertainty, 95% confidence level) that was calculated using the literature data. [ABSTRACT FROM AUTHOR]
ISSN:00219614
DOI:10.1016/j.jct.2022.106857