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The synthesis and single crystal X-ray structures of the cobalt(II) complexes [Co{N(SPPh2)2}2] 1, [Co{N(SPPr2i)2}2] 2, [Co{N(SePPh2)2}2] 3 and [Co{N(SePPr2i)2}2] 4, synthesised by the reaction of cobalt(II) acetate with the sodium salt of the appropriate ligand in methanol are reported. All four compounds consist of discrete, monomeric molecules in which the ligands are found to be bidentate, conferring a distorted tetrahedral co-ordination geometry around the cobalt centres. The resulting MX2P2N rings are found to be puckered. The 31P NMR studies of compounds 1–3 reveal one peak for each complex shifted upfield of the standard, whereas that for 4 is found downfield. The synthesis of NH(SePPr2i)2}2 is reported for the first time. |
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