Enthalpies and entropies of fusion and of sublimation at the temperature 298.15 K of thiourea and sevenN-alkylthioureas

Gatta, Giuseppe; Jóźwiak, Małgorzata; Brunetti, Bruno; Abate, L.

doi:10.1006/jcht.2000.0662

Cited by 22 publications

(8 citation statements)

References 39 publications

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“…The enthalpy of fusion Δ fus H is 15.67 kJ·mol –1 (the uncertainty is 0.78 kJ·mol –1 , 0.95 level of confidence). The melting temperature and enthalpy of fusion obtained in our work are generally consistent with those reported values in the literatures. − Minor deviation may be caused by differences in equipment, test conditions, and sample purity. Detailed comparisons are listed in the Supporting Information (Tables S1 and S2).…”

Section: Results and Discussionsupporting

confidence: 89%

Solid–Liquid Phase Equilibrium and Thermodynamic Analysis of N,N′-Diethylthiourea in Different Solvent Systems

Yao

Shi

et al. 2019

J. Chem. Eng. Data

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In this work, the solid–liquid phase equilibrium of N,N′-diethylthiourea (DETU) was investigated in different solvent systems from both solid-state structure and solution thermodynamics. The single-crystal structure of DETU was determined for the first time, and the intermolecular hydrogen bonding N–H···S interactions are dominant in the crystal packing. The thermodynamic equilibrium solubility was determined by the gravimetric method in 12 solvents (methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butyl alcohol, n-pentanol, acetone, butanone, methyl acetate, ethyl acetate, and acetonitrile) from 283.15 to 323.15 K. It was found that the solubility in alcohols decreases with increasing the length of the carbon chain and follows the rule of “like dissolves like”, whereas in non-alcohol solvents, the rule does not apply. The experimental data were further correlated by the modified Apelblat equation, λh equation, and NRTL model. All the correlation derivations are lower than 5%, and the NRTL model receives the best fitting performance. Furthermore, the thermodynamic functions of mixing including enthalpy, entropy, and Gibbs energy were derived, and the results expectedly suggest a spontaneous and entropy-driven mixing process. All the crystallographic and thermodynamic data reported in this study will provide the fundamental data for designing and optimizing the crystallization of DETU.

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Section: Results and Discussionsupporting

confidence: 89%

Solid–Liquid Phase Equilibrium and Thermodynamic Analysis of N,N′-Diethylthiourea in Different Solvent Systems

Yao

Shi

et al. 2019

J. Chem. Eng. Data

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“…This paper reports the results of a study on the thermodynamics of hydration at infinite dilution (i.d.) of thiourea, TU, and some of its N -alkylderivatives, namely, methylthiourea, MMTU, ethylthiourea, METU, dimethyl-1,3-thiourea, D(1,3)MTU, diethyl-1,3-thiourea, D(1,3)ETU, and tetramethyl-1,1,3,3-thiourea, T(1,1,3,3)MTU, as a continuation of our investigations on solute–solvent interactions of urea and its mono-, di-, tri-, and tetrasubstituted N -alkyl derivatives. , Thiourea enthalpies and entropies of both fusion and sublimation and heat capacities in the solid state were previously reported. In this paper we conclude the thermodynamic characterization of thiourea and N -alkyl derivatives by providing the hydration enthalpy and partial molar heat capacity, as well as the corresponding contributions of both polar and apolar moieties.…”

Section: Introductionmentioning

confidence: 72%

“…The molar enthalpy of solvation, Δ solv H m ∞ , corresponding to the transfer of 1 mol of solute from the ideal gaseous phase to aqueous solution at i.d. was derived by combining molar enthalpy of solution at i.d., Δ sol H m ∞ , and standard molar enthalpy of sublimation, Δ sub H m o , at 298.15 K: normalΔ solv H normalm ∞ = normalΔ sol H normalm ∞ − normalΔ sub H normalm normalo The enthalpies of solvation at 298.15 K for thiourea and the five N -alkylthioureas together with the enthalpies of solution and sublimation used for their derivation are presented in Table , columns 2 to 4. The enthalpies of solvation for urea and corresponding N -alkylureas obtained by us , are reported for comparison (column 6).…”

Section: Resultsmentioning

confidence: 99%

“… a Reference . b Reference . c Reference . Uncertainties of Δ solv H m ∞ calculated by the error propagation rule. …”

Section: Resultsmentioning

confidence: 99%

“…Infrared spectra showed no traces of water in any of the purified compounds. Their final purity was always better than 0.995 mass fraction, as determined by the differential scanning calorimetry (DSC) peak profile method. , …”

Section: Methodsmentioning

confidence: 98%

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Hydration of Thiourea and Mono-, Di-, and Tetra-N-Alkylthioureas at Infinite Dilution: A Thermodynamic Study at a Temperature of 298.15 K

et al. 2011

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Molar enthalpies of solution in water, Δsol H m, of thiourea, methylthiourea, ethylthiourea, dimethyl-1,3-thiourea, diethyl-1,3-thiourea, and tetramethyl-1,1,3,3-thiourea were measured at T = (296.84, 302.45, and 306.89) K by isothermal calorimetry. Experimental results were used to derive molar enthalpies of solvation at infinite dilution (i.d.), Δsolv H m ∞, changes in heat capacity due to the solution process, Δsol C p,m ∞, and partial molar heat capacities at i.d., C p,2 ∞, at T = 298.15 K. The methylene group contributions to the enthalpy of solvation and partial molar heat capacity were −4.5 kJ·mol–1 and 88.5 J·K–1·mol–1, respectively, in good agreement with our earlier data for N-alkylureas and the literature data for various homologous series of alkyl-substituted compounds. The contributions of the functional groups to both Δsolv H m ∞ and C p,2 ∞ were derived by employing additive schemes and compared with our earlier data for urea and corresponding N-alkylureas. Hydration behavior at the i.d. of thiourea, urea, and corresponding N-alkyl derivatives were compared and discussed.

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Enthalpies and entropies of fusion of ten alkane-α, ω-diamines H2 N– (CH 2)n– NH2 where 3⩽n⩽12

Dall’Acqua

Gatta

Nowicka

et al. 2002

The Journal of Chemical Thermodynamics

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Enthalpies and entropies of fusion and of sublimation at the temperature 298.15 K of thiourea and sevenN-alkylthioureas

Cited by 22 publications

References 39 publications

Solid–Liquid Phase Equilibrium and Thermodynamic Analysis of N,N′-Diethylthiourea in Different Solvent Systems

Solid–Liquid Phase Equilibrium and Thermodynamic Analysis of N,N′-Diethylthiourea in Different Solvent Systems

Hydration of Thiourea and Mono-, Di-, and Tetra-N-Alkylthioureas at Infinite Dilution: A Thermodynamic Study at a Temperature of 298.15 K

Enthalpies and entropies of fusion of ten alkane-α, ω-diamines H2 N– (CH 2)n– NH2 where 3⩽n⩽12

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