Thermal decomposition of potassium hexanitronickelate(II) hydrate |
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| Authors: | Elif Subasi Matthew J Almond |
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| Institution: | a Dokuz Eylül University, Faculty of Science and Arts, Department of Chemistry, Buca Tinaztepe, 35160 ?zmir, Turkey
b Reading University, Department of Chemistry, Whiteknights, Reading RG6 6AD, UK |
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| Abstract: | The thermal decomposition of the complex K4Ni(NO2)6]·H2O has been investigated over the temperature range 25-600 °C by a combination of infrared spectroscopy, powder X-ray diffraction, FAB-mass spectrometry and elemental analysis. The first stage of reaction is loss of water and isomerisation of one of the coordinated nitro groups to form the complex K4Ni(NO2)4(ONO)]·NO2. At temperatures around 200 °C the remaining nitro groups within the complex isomerise to the chelating nitrite form and this process acts as a precursor to the loss of NO2 gas at temperatures above 270 °C. The product, which is stable up to 600 °C, is the complex K4Ni(ONO)4]·NO2, where the nickel atom is formally in the +1 oxidation state. |
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| Keywords: | Thermal analysis Nickel(II) Nitro Potassium salt X-ray diffraction IR data |
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