(SE,O)-COORDINATED COMPLEXES OF SUBVALENT MAIN-GROUP METALS - THE CRYSTAL-STRUCTURE OF BIS(N,N-DIETHYL-N'-BENZOYLSELENOUREATO)LEAD(II)

Bis(N,N-diethyl-N'-benzoylselenoureato)lead(II) has been prepared and characterized by single-crystal structure analysis. Pb(C12H15N2OSe)(2) crystallizes in the non-centrosymmetric orthorhombic space group Iba2 . The cell parameters are a = 13.206(3), b = 20.542(4), c = 10.089(2) Angstrom and Z = 4, R = 0.025. The direction of the polar axis was det ermined unambiguously. Pb(II) is bidentally coordinated to two N,N-die thyl-N'-benzoylselenourea molecules. The coordination polyhedron is a distorted pseudo-trigonal bi-pyramid with one equatorial position occu pied by an electron lone-pair. The Pb-Se and Pb-O bond lengths are 2.8 76(1) and 2.444(4) Angstrom, respectively. In the crystal lattice, eac h Pb atom also shows interactions with two Se atoms of a neighboring m olecule. The Pb-Se distance of that interaction is 3.643 Angstrom.