Co-ordination complexes containing multidentate ligands. Part XI. Transition-metal derivatives of 1,3-bis(3′-dimethylarsinopropylthio)propane, a facultative quadridentate ligand with diverse donor properties
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 22,p. 2321-2326
- https://doi.org/10.1039/dt9760002321
Abstract
The synthesis of the facultative quadridentate ligand. 1,3-bis(3′-dimethylarsinopropylthio)propane (L), is described. Twenty complexes of CoII, NiII, PdII, and PtII have been prepared and the variety of the resulting stereochemistries demonstrates the utility of open-chain ligands in allowing such factors as electronic properties of the metal ions, nature of the solvent, and counter ions to also dictate structure. tans-Pseudo-octahedral [NiX2L] complexes are obtained for X = Cl, Br, or NCS, but for X = I the diamagnetic [NiIL]I results. The [NiCl2L] complex undergoes facile transformation to planar [NiL]X2, via a trigonal-bipyramidal intermediate. An unusual type of trans-chelating bidentate behaviour is observed on dissolving [MXL]+(M = Pd or Pt) complexes, which have a MAs2S2X donor set in the solid state and in nitromethane. in halogeno-organic solvents to form planar [MX2L] species with the donor set MAs2X2.Keywords
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