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Stoichiometric diversity of Ni(II) metallacrowns with β-alaninehydroxamic acid in aqueous solution

By M. Remelli, D. Bacco, F. Dallavalle, E. Lazzari, N. Marchetti and M. Tegoni


The system consisting of Ni(II) and β-AlaHA (β-alanyl-hydroxamic acid was investigated in order to verify the possible formation of metallacrowns, in aqueous solution. The system Ni(II)/AHA (acetohydroxamic acid) was also studied, for the sake of comparison, The techniques used for this purpose were the following: potentiometry, which gives the speciation model consisting in the formation constants and stoichiometries of formed complexes; electro-spray ionization mass spectrometry (ESI-MS) , in order to confirm the stoichiometry of the species; solution calorimetry, giving the complex-formation thermodynamic quantities ΔH° and ΔS°, useful to hypothesize complex structure in combination with UV-Vis spectra at different pH values

Topics: Metallacrowns, β-aminohydroxamic acids, solution equilibria, metal complexes thermodynamics, host-guest equilibria
Year: 2013
DOI identifier: 10.1039/c3dt50370d
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