Novel cyclic pentacoordinate and pseudo-pentacoordinate lead compounds

Article abstract of DOI:10.1080/10426509608037960

The new bicyclic lead(II) phosphinate [(t-Bu)₂PO₂]₂Pb (1) was synthesized by the reaction of p-tolyllead triacetate with di-t-butylphosphinic acid and water. An X-ray study showed that it had a pseudo-trigonal bipyramidal geometry (p-TBP) with a stereochemically active lone pair of electrons occupying an equatorial site. Infrared data ruled out the possible presence of a Pb-H bond. A series of new monocyclic Pb(IV) compounds, [Et₄N][(MeC₆H₃S₂)PbPh₂X] where X = Br (2), Cl (3), and F (4), was synthesized from the addition reaction of tetraethylammonium halide to 2,2-diphenyl-1,3,2-toluene dithiolato plumbole(IV), (MeC₆H₃S₂)PbPh₂ (5). An X-ray study of 3 revealed a monocyclic anionic TBP geometry which was compared with related dithiolato cyclic structures formed earlier by lighter elements of Group IVA. The lead(II) compound 1 crystallizes in the monoclinic space group C2/c with a = 15.594(4) A, b = 16.889(3) A, c = 12.642(2) A, β = 136.85(1)°, and Z = 4. The lead(IV) compound 3 crystallizes in the monoclinic space group P2₁/c with a = 12.245(5) A, b = 12.049(3) A, c = 19.048(4) A, β = 96.22(2)°, and Z = 4. The conventional unweighted residuals are 0.023(1) and 0.0387 (3).

Full text of DOI:10.1080/10426509608037960

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Phosphorus, Sulfur, and Silicon and
the Related Elements
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NOVEL CYCLIC PENTACOORDINATE
AND PSEUDOPENTACOORDINATE LEAD
COMPOUNDS
V. Chandrasekhar a , A. Chandrasekaran a , Roberta O. Day a
Joan M. Holmes a & Robert R. Holmes a
,
a Department of Chemistry , University of Massachusetts , Box
34510, Amherst, MA, 01003-4510, USA
Published online: 24 Sep 2006.
To cite this article: V. Chandrasekhar , A. Chandrasekaran , Roberta O. Day , Joan M. Holmes &
Robert R. Holmes (1996) NOVEL CYCLIC PENTACOORDINATE AND PSEUDOPENTACOORDINATE LEAD
COMPOUNDS, Phosphorus, Sulfur, and Silicon and the Related Elements, 115:1, 125-139, DOI:
10.1080/10426509608037960
To link to this article: http://dx.doi.org/10.1080/10426509608037960
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