Cation-specific and anion-specific Abraham Model correlations for solute transfer into ionic liquid solvents

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	Global Journal of Physical Chemistry. Volume 2, Issue 3 (2011) pp. 294-301
	Research Article

	Determination of standard molar enthalpies of formation of complexes involving rare earth chloride with glycine
	Wenjie Zhao ^a, Fei Liu ^b, Lijun Wang^b, Fushan Yu^b, Lingling Zhang^b, Xuwu Yang^b,*

	^a Department of Biochemical Engineering, Xianyang Vocational Technical College, Xianyang, 712000, P. R. China ^b Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry and Materials Science, Northwest University, Xi’an, 710069, P. R. China

	Abstract
	The constant-volume combustion energies, Δ_cU, have been determined for 15 solid complexes of rare earth chloride with glycine by a precise rotating-bomb calorimeter. The standard molar enthalpies of combustion, Δ_cH_m^Θ and standard molar enthalpies of formation, Δ_fH_m^Θ, at T = 298.15 K have been calculated for these complexes. The relationship of Δ_fH_m^Θ with the atomic numbers of the elements in the lanthanide series has been examined. The results show that a certain amount of covalence is present in the chemical bond between the rare earth and glycine. Furthermore, corresponding Δ_fH_m^Θ of Pm(Gly)₃ Cl₃ ·3H₂O was estimated as -2698 kJ·mol -1.

	Keywords
	Glycine; rare earth chloride; solid complexes; standard molar enthalpy of formation; precise rotating-bomb calorimeter

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