STRUCTURE OF LEAD(2) O,O-DIISOPROPYLPHOSPHORODITHIOATE

We have found a new compound of lead(II) containing seven, electron-pairs in its valence shell, one of which is a stereochemically active lone pair of electrons. It is the first authentic example of its kind for a non-transition element and represents a substantial contribution to the understanding of the stereochemistry of non-transition metal complexes. The crystal structure of Pb[(i-C3H7O)2PS2]2 contains lead in coordination with six sulphur atoms. The observed bond lengths and angles are fully consistent with the classical apportioning of fourteen electrons (seven pairs) in the valence shell of lead (four from the lead atom plus a total of ten from the six sulphur atoms) in which six pairs are bonding and one is a lone pair. The stereochemical arrangement of these seven pairs is in very close accord with the simple electron-pair repulsion model of Sidgwick and Powell1 and Gillespie and Nyholm2-5. © 1969 Nature Publishing Group.