NDLI: Molar heat capacities and solution thermochemistry of n-undecylammonium bromide monohydrate C$_{11}$H$

Content Provider	Springer Nature Link
Author	Wang, Z. Li, B. Zhang, Y. H. Wang, M. Kong, Y. X. Di, Y. Y. Dou, J. M.
Copyright Year	2015
Abstract	Crystal structure of n-undecylammonium bromide monohydrate was determined by X-ray crystallography. Molar enthalpies of dissolution of the compound at different concentrations (m/mol kg$^{−1}$) were measured by an isoperibol solution reaction calorimeter at T = 298.15 K. According to the Pitzer electrolyte solution theory, molar enthalpy of dissolution of the compound at infinite dilution was determined as $$ \Delta _{\text{s}} H_{\text{m}}^{\infty } ({\text{C}}_{11} {\text{H}}_{28} {\text{BrNO}}) $$ = 32.40 kJ mol$^{−1}$ and Pitzer’s parameters ( $$ \beta_{\text {MX}}^{(0)\text {L}} $$ and $$ \beta_{\text {MX}}^{(1)\text {L}} $$ ) were obtained. The values of apparent relative molar enthalpies ( $$ {}^{\varPhi}L $$ ) of the title compound and relative partial molar enthalpies ( $$ \overline{{L_{2} }} $$ and $$ \overline{{L_{1} }} $$ ) of the solute and the solvent at different concentrations were derived from experimental values of enthalpies of dissolution of the compound. Low-temperature heat capacities of the compound were measured by a precision automated adiabatic calorimeter over the temperature range from 78 to 390 K. Two solid–solid phase transitions were observed for the title compound. The temperatures, molar enthalpies and entropies of the phase transitions were determined as T $_{trs,1}$ = (314.42 ± 0.229) K, T $_{trs,2}$ = (338.66 ± 0.228) K, Δ$_{trs}$ H $_{m,1}$ = (15.542 ± 0.059) kJ mol$^{−1}$, Δ$_{trs}$ H $_{m,2}$ = (6.431 ± 0.209) kJ mol$^{−1}$, Δ$_{trs}$ S $_{m,1}$ = (49.803 ± 0.079) J K$^{−1}$ mol$^{−1}$ and Δ$_{trs}$ S $_{m,2}$ = (17.658 ± 0.072) J K$^{−1}$ mol$^{−1}$, respectively, based on the analysis of heat capacity curve. Two polynomial equations of heat capacities as a function of temperature were fitted by least squares method. Based on the two polynomial equations, smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated and tabulated at 5-K intervals.
Starting Page	1645
Ending Page	1655
Page Count	11
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	120
Issue Number	3
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-02-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	n-Undecylammonium bromide monohydrate Crystal structure Pitzer’s theory Enthalpy of dissolution Low-temperature heat capacity Solid–solid phase transition Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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