L. Hanton, J. Evans, W. Levason
1991
Citations
0
Influential Citations
6
Citations
Journal
Journal of The Chemical Society-dalton Transactions
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)A. 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.