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Type: Artigo de periódico
Title: Thermochemistry Of Dichlorobis[n-(2-pyridyl)acetamide]-zinc(ii), -cadmium(ii), And -mercury(ii)
Author: Goncalves A.S.
Chagas A.P.
Airoldi C.
Abstract: The standard enthalpy changes ΔHR ⊖ = -70.80 ± 0.60, -35.02 ± 0.72, and -22.90 ± 1.1 kJ mol-1 for M = Zn, Cd, and Hg respectively have been measured from the reaction MCl2(s) + 2pya(s) → [M(pya)2]Cl2(s) [pya = N-(2-pyridyl)acetamide], by using solution calorimetry. From these values, the standard enthalpy of formation of the ligand (ΔHf ⊖ = -149 ± 21 kJ mol-1) obtained via combustion calorimetry, and literature standard enthalpies of formation of the metal chlorides, the ΔHf ⊖ values have been determined as -785 ± 22, -724 ± 22, and 544 ± 23 kJ mol-1 for M = Zn, Cd, and Hg respectively. The standard enthalpy of sublimation of the ligand (103.8 kJ mol-1) has also been obtained. The standard enthalpies of the reactions MCl2(g) + 2pya(g) → [M(pya)2]Cl2(c) and MCl2(c) + 2pya(g) → [M(pya)2]Cl2(c) have been calculated.
Rights: fechado
Identifier DOI: 10.1039/DT9790000159
Date Issue: 1979
Appears in Collections:Unicamp - Artigos e Outros Documentos

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