The first reported syntheses and characterisation of alkali metal trifluoronickelate(II) monohydrates,MNiF3 · H2O (M = NH4, Na or K) |
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| Authors: | Mihir K Chaudhuri Soumitra K Ghosh Zavei Hiese |
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| Institution: | (1) Department of Chemistry, North-Eastern Hill University, 793003 Shillong, India |
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| Abstract: | Summary Ni(acac)2 · (H2O)2 (1 mol) and alkali metal fluorides (4 mols), MF (M=NH4, Na or K), react with an excess of 40% HF on a steam-bath. The product upon treatment with water gives light green crystalline alkali metal trifluoronickelate(II) monohydrate, MNiF3 · H2O in a high yield. Chemical analyses, pyrolysis at 120 °C, i.r. spectroscopic, and cryomagnetic (300–80 K) data have been used to characterise, and establish the identity of the compounds. While NH4NiF3 · H2O behaves as a normal octahedral nickel(II) compound, NaNiF3 · H2O is ferromagnetic with Curie point 145 K, KNiF3 · H2O behaves antiferromagnetically; its Neel point is 230 K. |
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