Hydration and solvation of lead(II) acetylacetonate and the coordination number of lead(II)

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299908934647· OSTI ID:20000558

Narbutt, J

Hydration of lead(II) acetylacetonate and its solvation by trioctylphosphine oxide and chloroform, were studied by solvent extraction and compared with those of zinc(II) acetylacetonate. The results suggest that the 6s{sup 2} lone electron pair of the Pb{sup II} ion in the chelate is stereochemically active. Renewed interest in lead(II) chemistry stems from a prominent role of the metal as environmental contaminant and also from the recognized diversity of coordination chemistry of the ion, related to the presence of a lone electron pair 6s{sup 2} on the Pb{sup 2+} ion . A great variety of coordination numbers (CN) of Pb{sup II} and structures of its complexes have been reported, depending on the character of the 6s{sup 2} electrons. The large ionic radius of Pb{sup II} results from the lone electron pair occupying 6s orbital, but the radium decreases to a value compared with that of Pb{sup IV} when the pair enters a hybrid orbital and becomes stereochemically active. Hancock et al observed a sudden marked increase of stability in a series of Pb{sup II} complexes with macrocyclic ligands where oxygen donor atoms were successively replaced by nitrogens, and attributed that to a change from a stereochemically inactive to active lone electron pair, followed by shortening of the metal-ligand distance.

• Research Organization: Inst. of Nuclear Chemistry and Technology, Warsaw (PL)
• OSTI ID: 20000558
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 5 Vol. 17; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ENVIRONMENTAL TRANSPORT
HYDRATION
LEAD COMPOUNDS
SOLVATION
ZINC COMPOUNDS