 ISSN 0235-7216 ISSN 2424-4538 (online) |
2009 m. Nr. 1 A novel copper potassium diphosphate – dimorphic Cu3K2(P2O7)2 • 3H2O
The article deals with the barely soluble compounds formed in the CuSO4–K4P2O7–H2O system. The precipitates were analysed by X-ray diffraction, chemical analysis and FTIR spectroscopy. It has been established that at least three poorly soluble compounds can form in the system. Their chemical formulae are Cu2P2O7 · 5H2O and Cu3K2(P2O7)2 · 3H2O (two polymorphs). A known form of Cu3K2(P2O7)2 · 3H2O (Dimorph A) or Cu2P2O7 · 5H2O transforms into a novel Dimorph B which has a different structure and has not been described in any previous publication. The vibration spectra point to a bent P–O–P bridge angle for all of these compounds. The values of this angle for copper–potassium and copper–ammonium salts as well as for Cu2P2O7 · 5H2O were estimated using Lazarev’s relationship and the plot given by Rulmont et al. Keywords: copper, diphosphate, XRD analysis, FTIR spectroscopy, polymorphism |
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