The first reported syntheses and characterisation of alkali metal trifluoronickelate(II) monohydrates, MNiF<SUB>3</SUB>. H<SUB>2</SUB>O (M = NH<SUB>4</SUB>, Na or K)
- Chaudhuri, Mihir K.
- Ghosh, Soumitra K.
- Hiese, Zavei
DOIAbstract
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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