Comprehensive chemical characterization of complexes involving lead-amino acid interactions |
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Authors: | Saunders Cheryl D L Longobardi Lauren E Burford Neil Lumsden Michael D Werner-Zwanziger Ulrike Chen Banghao McDonald Robert |
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Institution: | Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada. |
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Abstract: | Complexes of lead with L-phenylalanine, L-isoleucine, L-valine, or L-arginine have been isolated from reaction mixtures containing lead nitrate and the respective amino acid in acidic aqueous solution. The compounds have been comprehensively characterized using X-ray crystallography, solid state NMR spectroscopy and solution state NMR spectroscopy, IR and Raman spectroscopies, and electrospray ionization mass-spectrometry. The solid state structures of lead-phenylalanine, lead-valine, and lead-valine-isoleucine complexes show a lead center coordinated by two amino acid ligands, while the lead-arginine complex is a cluster involving two lead centers and three arginine molecules. The structural, spectroscopic, and spectrometric characterization of the complexes provides a basis to establish a fundamental understanding of heavy metal-amino acid interactions. |
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