Lead sequestering agents. 1. Synthesis, physical properties, and structures of lead thiohydroxamato complexes

Journal Article · Wed Feb 14 04:00:00 EST 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00160a034· OSTI ID:6707627

Abu-Dari, K; Hahn, F E; Raymond, K N ^[1]

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1. Univ. of California, Berkeley (USA)

In an approach to the synthesis of ligands specific for Pb{sup 2+}, lead complexes with mono- and bis(thiohydroxamic acids) have been prepared and characterized on the basis of their elemental analyses and their infrared, NMR, and UV spectra. The structures of the two compounds bis(N-methylthiobenzohydroxamato)lead(II) (2) and bis(N-methylthioacetohydroxamato)lead(II) (5) have been determined by single-crystal X-ray diffraction using automated counter methods. The structure of 2 is based on a five-coordinate geometry in which the sulfur atoms and the stereochemically active electron lone pair on Pb{sup 2+} occupy the equatorial positions of a trigonal bipyramid. The axial positions are occupied by the oxygen atoms and weak, outer-sphere coordination occurs from ligation by the thiohydroxamate oxygen atoms of adjacent molecules. Compound 5 exists in a similar pseudotrigonal-bipyramidal geometry in the solid state, but the equatorial positions are occupied by the lone electron pair on lead, one oxygen atom, and one sulfur atom. Bis(N-methylthiobenzohydroxamato)lead(II) (2) crystallizes in space group C2/c with Z = 4, a = 18.067 (2) {angstrom}, b = 12.518 (2) {angstrom}, c = 8.103 (1) {angstrom} and {beta} = 101.93 (1){degree}. Bis(acetothiohydroxamato)lead(II) (5) crystallizes in space group P2{sub 1}/n with Z = 4, a = 7.958 (2) {angstrom}, b = 7.445 (1) {angstrom}, c = 19.007 (3) {angstrom}, and {beta} = 98.74 (2){degree}.

• OSTI ID: 6707627
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:4; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
550000 -- Biomedical Sciences
Basic Studies
59 BASIC BIOLOGICAL SCIENCES
CALCULATION METHODS
COMPLEXES
CRYSTAL STRUCTURE
DATA ANALYSIS
LEAD COMPLEXES
LIGANDS
MEASURING INSTRUMENTS
MEASURING METHODS
PHYSICAL PROPERTIES
SYNTHESIS