Thermodynamic properties of organic compounds in aqueous solution. II. Apparent molal heat capacities of piperidines,morpholines, and piperazines |
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| Authors: | Sergio Cabani Giovanni Conti Enrico Matteoli |
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| Affiliation: | (1) Istituto di Chimica Fisica, Università, Via Risorgimento 35, 56100 Pisa, Italy;(2) Laboratorio di Chimica Quantistica ed Energetica Molecolare del CNR, Via Risorgimento 35, 56100 Pisa, Italy |
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| Abstract: | Apparent molal heat capacities
of some piperidine, morpholine, and piperazine derivatives in aqueous solution have been determined by adiabatic calorimetry
in the temperature range 20–55°C and in the molality range 0.2–1m. Comparison of experimental
values with those calculated through group contributions, found for monofunctional compounds, indicates strong interactions
between the hydrophilic centers. An interpretation is given of the possible mechanism of this interaction. Also, values of
ΔC
p
for the addition reaction of proton to nitrogen centers of mono- and bifunctional organic compounds are examined. |
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| Keywords: | Apparent molal heat capacity aqueous solution piperidines morpholines piperazines heat capacity of protonation solute-water interaction |
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