Five-co-ordination in nickel(II) complexes. The crystal structure of dibromobis-(2-diphenylphosphinoethyl)aminenickel(II)
- 1 January 1970
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1511-1516
- https://doi.org/10.1039/j19700001511
Abstract
The crystal structure of the diamagnetic complex dibromobis-(2-diphenylphosphinoethyl)aminenickel(II), Ni·[HN[CH2·CH2·P(C6H5)2]2-Br2, has been determined from three-dimensional X-ray data collected by photographic methods. The structure has been refined by least-squares techniques to a conventional R of 0·049. Crystals of the compound belong to the space group Abm2 with the following cell dimensions : a= 15·01 ± 0·02, b= 24·55 + 0·02, c= 7·30 + 0·02 Å, Z= 4. The structure consists of discrete molecules, in which the nickel atom shows a distorted square-pyramidal co-ordination. Cs crystallographic symmetry is imposed on the molecule. The apical Ni–Br distance is 0·37 Å longer than the basal one. This lengthening is compared with results available for other low-spin square-pyramidal nickel(II) complexes and may be explained by the stereochemical activity of the 3d electrons of the metal.Keywords
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