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Type: Artigo de periódico
Title: Thermochemical Data For Adducts Of ε-caprolactam With Zinc(ii) Family Metal Halides
Author: Da Silva Z.R.
De Queiroz J.C.
Vieira E.F.S.
Dias F.S.
Abstract: From solution calorimetry and appropriate thermodynamic cycles, the standard molar enthalpies of acid-base reactions in the condensed state (ΔrHo) for MX2 · nCL (M is Zn, Cd, Hg; X is Cl, Br, I; n = 1, 2, 3 or 4; CL is ε-caprolactam) adducts have been determined. From ΔrHo values and literature data, the following thermochemical quantities have been calculated: standard enthalpy of formation (ΔfHo), standard enthalpy of decomposition (ΔdHo), standard lattice enthalpy (ΔlattHo), standard enthalpy of acid-base reaction in the gaseous phase (ΔgHo) and the mean dissociation enthalpy of the metal-oxygen bond, D̄(M-O). The thermochemical data are compared with those previously published for analogous BuL compounds (BuL is γ-butyrolactam or 2-pyrrolidone), with the purpose of evaluating the effect of ring strain on the donor oxygen strengths of both lactams. The thermochemical quantities are discussed in terms of acidity and basicity of the species and ΔgHo values correlated with ionic or covalent character of the metal halides.
Rights: fechado
Identifier DOI: 10.1016/0040-6031(96)02911-5
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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