Lattice potential energy and standard molar enthalpy in the formation of 1–dodecylamine hydrobromide (1–C12H25NH3·Br)(s)

doi:10.1088/1674-1056/20/2/028202

Abstract This paper reports that 1-dodecylamine hydrobromide (1–C₁₂H₂₅NH₃·Br)(s) has been synthesized using the liquid phase reaction method. The lattice potential energy of the compound 1–C₁₂H₂₅NH₃·Br and the ionic volume and radius of the 1–C₁₂H₂₅NH₃⁺ cation are obtained from the crystallographic data and other auxiliary thermodynamic data. The constant-volume energy of combustion of 1–C₁₂H₂₅NH₃·Br(s) is measured to be Δ_cU_m^o(1–C₁₂H₂₅NH₃·Br, s) =–(7369.03±3.28) kJ·mol^-1 by means of an RBC-II precision rotating-bomb combustion calorimeter at T=(298.15±0.001) K. The standard molar enthalpy of combustion of the compound is derived to be Δ_cH_m^o(1–C₁₂H₂₅NH₃·Br, s)=–(7384.52±3.28) kJ·mol^{- 1} from the constant-volume energy of combustion. The standard molar enthalpy of formation of the compound is calculated to be Δ_fH_m^o(1–C₁₂H₂₅NH₃·Br, s)=–(1317.86±3.67) kJ·mol^-1 from the standard molar enthalpy of combustion of the title compound and other auxiliary thermodynamic quantities through a thermochemical cycle.

Keywords: 1-dodecylamine hydrobromide lattice potential energy ionic radius standard molar enthalpy of formation

Received: 04 August 2010
Revised: 08 September 2010
Accepted manuscript online:

PACS:

82.60.Cx

(Enthalpies of combustion, reaction, and formation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 20673050 and 20973089).

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Liu Yu-Pu(刘玉普), Di You-Ying(邸友莹), Dan Wen-Yan(淡文彦), He Dong-Hua(何东华), Kong Yu-Xia(孔玉霞), and Yang Wei-Wei(杨伟伟) Lattice potential energy and standard molar enthalpy in the formation of 1–dodecylamine hydrobromide (1–C₁₂H₂₅NH₃·Br)(s) 2011 Chin. Phys. B 20 028202

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Lattice potential energy and standard molar enthalpy in the formation of 1–dodecylamine hydrobromide (1–C12H25NH3·Br)(s)

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Lattice potential energy and standard molar enthalpy in the formation of 1–dodecylamine hydrobromide (1–C₁₂H₂₅NH₃·Br)(s)