Thermochimica Acta p. 249 - 260 (1995)
Update date:2022-08-29
Topics:
Vieira, Eunice F. S.
Queiroz, Jose C. de
Dias, Francisco S.
The standard molar enthalpies of acid-base reactions in the condensed state (Δ(r)H(0)) of the adducts MX2 . nBuL (where M is Zn, Cd, Hg; Xis Cl, Br, I; n = 1, 2, 3; BuL is 2-pyrrolidone) were determined from e nthalpies of dissolution (Δ(i)H(0)) of metal halide ligands and adducts, at 298.15 K, obtained by calorimetric methods in solution. Using the values of Δ(r)H(0) and auxiliary data from the literature the standard enthalpies of formation (Δ(f)H(0)), decomposition (Δ(d)H(0)) and lattice enthalpy (Δ(latt)H(0)) of these adducts weredetermined. The enthalpy of vaporization of BuL, Δ(vap)H(0)(BuL), was found to be 41.71+/-0.56 kJ mol**-1 and, from this value, the entha lpies of reaction in the gaseous state (Δ(g)H(0)) were estimated. The values of Δ(g)H(0) were used in calculations of the mean dissociation enthalpy of the metal-oxygen bond, D(M-O), of the obtained adducts, and are correlated with energetic parameters of the metal halides.
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