Abstract (EN):
The standard (p(empty set) = 0.1 MPa) molar enthalpies of formation of the following crystalline nickel(IU) amino acid complexes were determined, at 298.15 K, by solution-reaction calorimetry: DELTA(f)Hm(empty set([Ni(gly)2, cr] = - 994.2 +/- 1.8 kJ mol-1; DELTA(f)H(m)empty set[Ni(ala)2, cr] = - 1072.4 +/- 2.3 kJ mol-1; DELTA(f)H(m)empty set[Ni(val)2, cr] = - 1173.7 +/- 2.5 kJ mol-1; DELTA(f)H(m)empty set[Ni(leu)2, cr] = - 1243.4 +/- 2.7 kJ mol-1; DELTA(f)H(m)empty set[Ni(isol)2, cr] = - 1224.1 +/- 2.1 kJ mol-1; DELTA(f)H(m)empty set[Ni(Phgly)2, cr] = - 857.0 +/- 2.8 kJ mol-1; DELTA(f)H(m)empty set[Ni(Phala)2, cr] = - 898.6 +/- 3.0 kJ mol-1. A linear correlation between the standard molar enthalpies of formation of the crystalline nickel(II) amino acid complexes and the crystalline amino acids is established. Estimations of the standard molar enthalpies of sublimation of the nickel(II) amino acid complexes are presented. The total binding energies in nickel(II) complexes of amino acids and of beta-diketonate ligands are compared.
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Nº de páginas:
11