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Stabilization of Al(III) solutions by complexation with cacodylic acid: speciation and binding features
Matteo Lari1, Héctor J Lozano, Natalia Busto
1Departamento de Química, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain. begar @ubu.es.
Physical Chemistry Chemical Physics : PCCP
|October 22, 2015
Summary
Cacodylic acid stabilizes aluminum (III) solutions, forming simple Al/Cac complexes like dimers, which is crucial for studying aluminum
Area of Science:
- Inorganic Chemistry
- Biochemistry
- Toxicology
Background:
- Aluminum ions are implicated in neurological and skeletal disorders.
- Al(3+) hydrolysis yields complex species and precipitates, complicating biological studies.
- Stabilizing Al(III) solutions under physiological conditions requires complexing agents.
Purpose of the Study:
- To investigate the interaction between aluminum (III) and cacodylic acid (HCac).
- To characterize the speciation and stoichiometry of aluminum-cacodylate complexes.
- To understand how cacodylate influences aluminum speciation in biological contexts.
Main Methods:
- Preliminary speciation analyses of Al(III) and cacodylic acid.
- Systematic study of Al/Cac complex formation across various pH values.
- UV-Vis titrations, mass spectrometry, NMR, and DFT calculations.
Main Results:
- Cacodylic acid forms stable Al/Cac complexes, even at pH 7.
- Al/Cac dimer complexes are predominant, with monomer and trimer forms also present.
- Cacodylate promotes simpler Al complexes, inhibiting the formation of the expected polymeric Al13 species.
Conclusions:
- Cacodylic acid effectively stabilizes Al(III) in solution, facilitating the study of its biological interactions.
- The formation of relatively simple Al/Cac complexes offers insights into aluminum's reactivity in biological systems.
- Understanding these interactions is vital for elucidating the role of aluminum in various health disorders.
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