Abstract
IN a recent communication1, Katzin has interpreted the appearance of blue colour in paramagnetic nickel(II) compounds as indicative of tetrahedral co-ordination. We have recently completed the determination of the crystal structure of Ni(en)2.(NCS)2 (Brown, B. W., and Lingafelter, E. C., unpublished work). This compound is blue and paramagnetic, but the co-ordination of the nickel ion is transoctahedral, with Ni—N distances of 2.10 A. to the ethylenediamine and 2.15 A. to the isothiocyanate. We are also investigating the crystal structure of Ni(en)(H2O)4(NO3)2, another blue paramagnetic compound. Although the study is still in the early stages and all atoms have not been located, the presence of a co-ordination octahedron about the nickel atom is already clear.
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Katzin, L. I., Nature, 182, 1013 (1958).
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LINGAFELTER, E. Tetrahedral Co-ordination of Nickel(II). Nature 182, 1730 (1958). https://doi.org/10.1038/1821730a0
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DOI: https://doi.org/10.1038/1821730a0
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