Nickel-(II), -(III) and -(IV) complexes of 1,2-bis(dimethylarsino)tetrafluorobenzene and X-ray crystallographic and extended X-ray absorption fine structure studies of nickel-(III) and -(IV) bromo complexes
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 8,p. 2039-2044
- https://doi.org/10.1039/dt9910002039
Abstract
1,2-Bis(dimethylarsino)tetrafluorobenzene, o-C6F4(AsMe2)2, forms high-spin tetragonal nickel(II) complexes [Ni(L–L)2X2](X = Cl or Br), which remain six-co-ordinate in non-polar solvents, and planar diamagnetic [Ni(L–L)2]I2. Pseudo-octahedral nickel-(III) and -(IV) complexes [Ni(L–L)2X2]n+ are formed on oxidation, and their properties are compared with those of the fluorine-free ligand o-C6H4(AsMe2)2. The X-ray crystal structure of trans-[Ni{o-C6F4(AsMe2)2}2Br2]BF4 has been determined, and revealed a tetragonal cation with Ni–Br 2.543(1) and Ni–As 2.336(1), 2.339(1)Å. Nickel and bromine K-edge extended X-ray absorption fine structure data are reported for a variety of complexes of NiII, NiIII and NiIV with o-C6F4(AsMe2)2, o-C6H4(AsMe2)2 and o-C6H4(PMe2)2, and the results compared with existing data on the chloride analogues.Keywords
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