The 14N NQR Spectrum and the Crystal Structure of Ba [Fe(CN)5NO] · 3H20 at Room Temperature
The reported 14N NQR spectrum of the CN groups of Ba [Fe(CN)5NO] • 3H20 BNP was shown to contain lines of traces of the Na [Fe(CN)5NO] • 3H20 BNP used in its preparation. A study of the intensity of the NQR lines confirmed that BNP has a Pbcm instead of a Pca22 space group as previously assumed. Therefore, the 3 CN sites found in BNP at room temperature increases to 5 below 233 and to 8 below 131 K as a result of phase transitions occurring at these temperatures. The effect of the disorder of some H2O molecules on the intensity of the lines of the axial CN group in BNP is also discussed.
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