SYNTHESIS OF PHOSPHINOCHALCOGENOIC AMIDATO COMPLEXES OF ZINC AND CADMIUM - THE CRYSTAL AND MOLECULAR-STRUCTURE OF [ZN(BU(2)(T)P(SE)NPRI)(2)]

The protolysis of zinc and cadmium amides [M{N(SiMe(3))(2)}(2)] with 2 equivalents of phosphinochalcogenoic amides Bu(2)(t)P(E)NHR (E = Se o r Te, R = Pr-i or C6H11) gave the complexes [M{Bu(2)(t)P(E)NR}(2)] (M = Zn or Cd). The thermally stable compounds are monomeric and sublime readily. If the protolysis reaction is carried out in a molar ratio of 1:1, the mixed-ligand compounds [Zn{N(SiMe(3))(2)}{Bu(2)(t)P(E)NR}] c an be isolated for zinc but not for cadmium. The crystal structure of [Zn{Bu(2)(t)P(Se)NPri}(2)] has been determined. The complex possesses a distorted tetrahedral structure. The ligands are bidentate, with sho rt [1.981(3) Angstrom] Zn-N and comparatively long [2.5375(9) Angstrom ] Zn-Se bonds.