TY - JOUR
T1 - The enthalpy of formation of gaseous tetra-n-propylammonium cations Dedicated to the memory of the late Professor Manuel Ribeiro da Silva
AU - Marcus, Yizhak
PY - 2014/4
Y1 - 2014/4
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) = ΔfH (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 ΔhH (R4N+, aq) is -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) = ΔfH (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 ΔhH (R4N+, aq) is -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.
KW - Enthalpy of formation of crystalline salts
KW - Enthalpy of formation of gaseous cation
KW - Enthalpy of hydration
KW - Lattice energy
KW - Tetraalkylammonium cations
UR - http://www.scopus.com/inward/record.url?scp=84891799542&partnerID=8YFLogxK
U2 - 10.1016/j.jct.2013.12.007
DO - 10.1016/j.jct.2013.12.007
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AN - SCOPUS:84891799542
SN - 0021-9614
VL - 71
SP - 196
EP - 199
JO - Journal of Chemical Thermodynamics
JF - Journal of Chemical Thermodynamics
ER -