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Energetics of lead(II), cadmium(II) and zinc(II) complexes with amino acids

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Abstract

The molar heat capacity and the standard (p 0 = 0.1 MPa) molar enthalpies of formation of the crystalline of bis(glycinate)lead(II), Pb(gly)2; bis(dl-alaninate)lead(II), Pb(dl-ala)2; bis(dl-valinate)lead(II), Pb(dl-val)2; bis(dl-valinate)cadmium(II), Cd(dl-val)2 and bis(dl-valinate)zinc(II), Zn(dl-val)2, were determined, at T = 298.15 K, by differential scanning calorimetry, and high precision solution-reaction calorimetry, respectively. The standard molar enthalpies of formation of the complexes in the gaseous state, the mean molar metal–ligand dissociation enthalpies, M(II)–amino acid, \( \langle D_{\text{m}} \rangle \)(M–L), were derived and compared with analogous copper(II)–ligand and nickel(II)–ligand.θθ

M(II)–amino acid

\( \Updelta_{\text{f}} H_{\text{m}}^{\text{o}} \)(cr)/kJ mol−1

Bis(glycinate)lead(II), Pb(gly)2

−998.9 ± 1.9

Bis(dl-alaninate)lead(II), Pb(ala)2

−1048.7 ± 1.8

Bis(dl-valinate)lead(II), Pb(val)2

−1166.3 ± 2.5

Bis(dl-valinate)cadmium(II), Cd(val)2

−1243.7 ± 2.7

Bis(dl-valinate)zinc(II), Zn(val)2

−1306.1 ± 2.3

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Acknowledgements

Thanks are due to FCT (Fundação para a Ciência e Tecnologia), Lisboa, Portugal and to FEDER for financial support granted to Centro de Investigação em Química da Universidade do Porto.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Centro de Investigação em Química, University of Porto, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal

    Manuel A. V. Ribeiro da Silva, Luís M. N. B. F. Santos, Ana C. P. Faria & Filipa S. A. Sistelo

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  1. Manuel A. V. Ribeiro da Silva
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  2. Luís M. N. B. F. Santos
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Correspondence to Manuel A. V. Ribeiro da Silva.

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Ribeiro da Silva, M.A.V., Santos, L.M.N.B.F., Faria, A.C.P. et al. Energetics of lead(II), cadmium(II) and zinc(II) complexes with amino acids. J Therm Anal Calorim 100, 475–482 (2010). https://doi.org/10.1007/s10973-009-0650-y

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