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Type: Artigo de periódico
Title: A calorimetric investigation into copper-arginine and copper-alanine solid state interactions
Author: de Farias, RF
Martinez, L
Airoldi, C
Abstract: Complexes of formula CuCl2 . 2arg and CuCl2 . 4ala (arg = arginine; ala = alanine) were prepared at room temperature by a solid state route. The metal-amino acid solid state interactions were studied by i.r. spectroscopy and solution calorimetry. For both complexes, participation of the carboxylate group as well as nitrogen in coordination are inferred, based on the i.r. data. For the copper-arginine compound, the calculated thermochemical parameters are: Delta(r)H(m)(theta) = -114.9 +/- 1.42 and Delta(f)H(m)(theta) = -1608.3 +/- 11.6 kJ mol(-1). For copper-alanine compound, a complete set of thermochemical parameters were calculated: Delta(r)H(m)(theta) = -18.0 +/- 0.9; Delta(f)H(m)(theta) = -2490.4 +/- 4.3; Delta(D)H(m)(theta) = 597.2 +/- 17.7; Delta(M)H(m)(theta) = 771.9 +/- 18.7; Delta(g)H(m)(theta) = 627.1 +/- 22.3 and [D] (Cu-L) = 156.8 +/- 5.7 kJ mol(-1). Based on Delta(r)H(m)(theta) and dissolution enthalpy values, a stronger intermolecular solid state interaction can be inferred for the arginine complex, than for the alanine one complex, probably due to the formation of intermolecular hydrogen bonds in the former.
Country: Holanda
Editor: Kluwer Academic Publ
Rights: fechado
Identifier DOI: 10.1023/A:1014842827521
Date Issue: 2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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