Abstract
LINGAFELTER1 has suggested that the occurrence of blue-coloured Ni en2(NCS)2 and Ni en(H2O)4 (NO3)2 for which X-ray evidence gives 6 co-ordination for the nickel atom contradicts the criteria for identifying tetrahedrally co-ordinated Ni(II) suggested in my earlier communication of the same title2, with the implication that these criteria are invalid.
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References
Lingafelter, E. C., Nature, 182, 1730 (1958).
Katzin, L. I., Nature, 182, 1013 (1958).
Ballhausen, C. J., Dan. Mat. Fys. Medd., 29, No. 8 (1955).
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KATZIN, L. Tetrahedral Co-ordination in Ni(II). Nature 183, 1672–1673 (1959). https://doi.org/10.1038/1831672b0
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DOI: https://doi.org/10.1038/1831672b0
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