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DOI: 10.1039/A604961C (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 1025-1030

Structural diversity of four-co-ordinate metal(II) compounds with the bidentate bis(diphenylselenophosphoryl)amide ligand, [M{N(PPh2Se)2-Se, Se′}2] (M = Sn, Pb, Zn, Cd or Hg)

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Verónica García-Montalvo, Josef Novosad, Petr Kilian, J. Derek Woollins, Alexandra M. Z. Slawin, Patricia García y García, Marcela López-Cardoso, Georgina Espinosa-Pérez and Raymundo Cea-Olivares

Abstract

The [N(PPh2Se)2]- ion formed stable bis-chelates with MII (M = Sn, Pb, Zn, Cd or Hg), [M{N(PPh2Se)2-Se,Se′ }2], which exhibit a large diversity of structural arrangements around the metal, as shown by X-ray crystallography. The tin(II) complex crystallises dimorphically, as yellow triclinic prisms (1) and red tetragonal octahedrons (1′). The yellow isomer is square planar, representing the first example of a true square-planar tin(II) spiro-compound. The red isomer and the lead(II) compound (2) exhibit a distorted ψ-trigonal-bipyramidal co-ordination geometry with a vacant equatorial position, which suggests the presence of a stereoactive electron lone pair. The cadmium(II) and mercury(II) complexes (3 and 4) are tetrahedral.

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