Thermochemistry of the Coordination Compounds of Zinc Nitrate with Several L-alfa-Amino Acids

• Autorzy: Di Y. Y.
• Języki publikacji: EN

Abstrakty

EN

Molar enthalpies of dissolution of {ZnSO4×7H2O(s) + 2NaNO3(s) + L-AA(s)} (in which AA stand for phenylalanine, histidine and methionine) in 100 cm3 of 2 mol×dm-3 HCl at T = (298.15 š 0.001) K have been measured to be deltaHm,1 o = (69.417 š 0.051) kJ×mol-1, (79.830 š 0.058) kJ×mol-1, and (56.929 š 0.051) kJ×mol-1, respectively, by means of an isoperibol solution-reaction calorimeter. Molar enthalpies of dissolution of {Zn(AA)(NO3)2×xH2O(s) + Na2SO4(s)} (in which x = 1 for phenylalanine, x = 1/2 for histidine and methionine) under the same conditions have been determined to be deltaHm,2 o = (48.137 š 0.038) kJ×mol-1, (51.146 š 0.041) kJ×mol-1, and (37.337 š 0.029) kJ×mol-1, respectively, using the calorimeter. The standard molar enthalpies of formation of these complexes Zn(AA)(NO3)2×xH2O(s) have been derived to be delta fHm o [Zn(Phe)(NO3)2×H2O, s, 298.15 K] = -(1367.07 š 3.52) kJ×mol-1, delta fm o [Zn(His)(NO3)2×1/2H2O, s, 298.15 K] = -(1207.19 š 2.82) kJ×mol-1, and delta fHm o [Zn(Met)(NO3)2×1/2H2O, s, 298.15 K] = -(1327.08 š 0.75) kJ×mol-1, respectively, by the combination of the experimental values of enthalpies of dissolution with some auxiliary thermodynamic data through a designed Hess thermochemical cycle on the basis of a supposed chemical reaction.

Słowa kluczowe

EN

Zn(AA)(NO3)2×xH2O(s); isoperibol solution-reaction calorimetry; standard molar enthalpy of dissolution; standard molar enthalpy of formation

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2008
• Tom: Vol. 82, nr 3
• Strony: 599--606
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Di Y. Y.

• College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, Shandong, P.R. China Fax: [phone],

Bibliografia

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