Abstract
Two forms of Ni(II) compounds have been recognized for a long time, the green paramagnetic forms and the (yellow) diamagnetic forms. The nature of these has been described in terms of electronic structure by Pauling1, as a paramagnetic 6-co-ordinate form with two unpaired electrons and a square planar form with hydridized orbitals leading to diamagnetism through electron pairing. The magnetic criterion has been completely satisfactory in differentiating these two. There is another 4-co-ordinate configuration theoretically possible, namely, the tetrahedral, which also would have two unpaired electrons. No obvious criterion presents itself for differentiation of this from the octahedral 6-co-ordinate condition.
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References
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KATZIN, L. Tetrahedral Co-ordination in Ni(II). Nature 182, 1013–1014 (1958). https://doi.org/10.1038/1821013a0
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DOI: https://doi.org/10.1038/1821013a0
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