Reprint of: The enthalpy of formation of gaseous tetra-n-propylammonium cations

Yizhak Marcus

doi:10.1016/j.jct.2014.03.019

Reprint of: The enthalpy of formation of gaseous tetra-n-propylammonium cations

Yizhak Marcus^*

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

The standard molar enthalpies of formation of crystalline tetraalkylammonium halides, Δ_fH°(R₄NX, c), R = Me, Et, Pr, Bu and X = Cl, Br, I, and the corresponding lattice energies, U _L(R₄NX) were obtained from the literature as far as available for T = 298.15 K. From consistent values of these two quantities and values for Δ_fH°(X^-, g) the standard molar enthalpies of formation of the gaseous cations were obtained from Δ_fH°(R₄N⁺, g) = Δ _fH°(R₄NX, c) + U_L(R₄NX) + 2RT° - Δ_fH°(X^-, g). The value for the hitherto unreported Δ_fH°(Pr₄N⁺, g) = (307 ± 7) kJ · mol is here derived. The value for the absolute standard molar enthalpy of hydration is Δ_hH°(R ₄N⁺, aq) -210 kJ · mol^-1, but may have an appreciable uncertainty, reflecting that of Δ_fH°(R ₄N⁺, aq), obtained from interpolation of values for the Me, Et, and Bu analogues.

Original language	English
Pages (from-to)	296-299
Number of pages	4
Journal	Journal of Chemical Thermodynamics
Volume	73
DOIs	https://doi.org/10.1016/j.jct.2014.03.019
State	Published - Jun 2014

Keywords

Enthalpy of formation of crystalline salts
Enthalpy of formation of gaseous cation
Enthalpy of hydration
Lattice energy
Tetraalkylammonium cations

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10.1016/j.jct.2014.03.019

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title = "Reprint of: The enthalpy of formation of gaseous tetra-n-propylammonium cations",

abstract = "The standard molar enthalpies of formation of crystalline tetraalkylammonium halides, ΔfH°(R4NX, c), R = Me, Et, Pr, Bu and X = Cl, Br, I, and the corresponding lattice energies, U L(R4NX) were obtained from the literature as far as available for T = 298.15 K. From consistent values of these two quantities and values for ΔfH°(X-, g) the standard molar enthalpies of formation of the gaseous cations were obtained from ΔfH°(R4N+, g) = Δ fH°(R4NX, c) + UL(R4NX) + 2RT° - ΔfH°(X-, g). The value for the hitherto unreported ΔfH°(Pr4N+, g) = (307 ± 7) kJ · mol is here derived. The value for the absolute standard molar enthalpy of hydration is ΔhH°(R 4N+, aq) -210 kJ · mol-1, but may have an appreciable uncertainty, reflecting that of ΔfH°(R 4N+, aq), obtained from interpolation of values for the Me, Et, and Bu analogues.",

keywords = "Enthalpy of formation of crystalline salts, Enthalpy of formation of gaseous cation, Enthalpy of hydration, Lattice energy, Tetraalkylammonium cations",

author = "Yizhak Marcus",

year = "2014",

month = jun,

doi = "10.1016/j.jct.2014.03.019",

language = "אנגלית",

volume = "73",

pages = "296--299",

journal = "Journal of Chemical Thermodynamics",

issn = "0021-9614",

publisher = "Academic Press",

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AU - Marcus, Yizhak

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N2 - The standard molar enthalpies of formation of crystalline tetraalkylammonium halides, ΔfH°(R4NX, c), R = Me, Et, Pr, Bu and X = Cl, Br, I, and the corresponding lattice energies, U L(R4NX) were obtained from the literature as far as available for T = 298.15 K. From consistent values of these two quantities and values for ΔfH°(X-, g) the standard molar enthalpies of formation of the gaseous cations were obtained from ΔfH°(R4N+, g) = Δ fH°(R4NX, c) + UL(R4NX) + 2RT° - ΔfH°(X-, g). The value for the hitherto unreported ΔfH°(Pr4N+, g) = (307 ± 7) kJ · mol is here derived. The value for the absolute standard molar enthalpy of hydration is ΔhH°(R 4N+, aq) -210 kJ · mol-1, but may have an appreciable uncertainty, reflecting that of ΔfH°(R 4N+, aq), obtained from interpolation of values for the Me, Et, and Bu analogues.

AB - The standard molar enthalpies of formation of crystalline tetraalkylammonium halides, ΔfH°(R4NX, c), R = Me, Et, Pr, Bu and X = Cl, Br, I, and the corresponding lattice energies, U L(R4NX) were obtained from the literature as far as available for T = 298.15 K. From consistent values of these two quantities and values for ΔfH°(X-, g) the standard molar enthalpies of formation of the gaseous cations were obtained from ΔfH°(R4N+, g) = Δ fH°(R4NX, c) + UL(R4NX) + 2RT° - ΔfH°(X-, g). The value for the hitherto unreported ΔfH°(Pr4N+, g) = (307 ± 7) kJ · mol is here derived. The value for the absolute standard molar enthalpy of hydration is ΔhH°(R 4N+, aq) -210 kJ · mol-1, but may have an appreciable uncertainty, reflecting that of ΔfH°(R 4N+, aq), obtained from interpolation of values for the Me, Et, and Bu analogues.

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KW - Enthalpy of formation of gaseous cation

KW - Enthalpy of hydration

KW - Lattice energy

KW - Tetraalkylammonium cations

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ER -

Reprint of: The enthalpy of formation of gaseous tetra-n-propylammonium cations

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