Abstract
The interaction of lead with biologically relevant ligands, such as citrate, constitutes a major research thrust relating to toxic effects exerted on humans. Reaction of Pb(NO 3) 2 with citric acid in water at pH 2 and various ratios (1:1–1:3) yielded the first Pb–citrate species, which was characterized analytically and spectroscopically (FT-IR). X-ray crystallographic studies were carried out and showed the novel compound to be [Pb(C 6H 6O 7)] n · nH 2O. The geometry around Pb 2+ appears to be distorted trigonal bipyramidal with PbO distances ranging from 2.397(7) to 2.527(6) Å and the lone pair on Pb 2+ occupying one of the three basal plane positions. Citrate binds Pb 2+ forming rhomboidal Pb 2O 2 units, while it subtends its terminal carboxylate onto a proximal Pb 2+, thus linking adjacent Pb 2O 2 units into a chain along the a axis. The involvement of citrate in hydrogen bonds with water molecules and abutting Pb–citrate moieties leads to a stable structure. The stability of the species formed and eventually isolated from aqueous solutions as well as its reactivity toward bases present useful information on the chemistry in biological media and its relevance to the known biotoxicity of lead.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
