AgNO3⋅NH4NO3 – an enigmatic double‐salt type "decomposition intermediate" of diamminesilver(I) permanganate. Issue 11 (5th May 2021)

• Record Type: Journal Article
• Authors: Béres, Kende Attila; Petruševski, Vladimir; Holló, Berta Barta; Németh, Péter; Fogaça, Lara; Paiva Franguelli, Fernanda; Farkas, Attila; Menyhárd, Alfréd; Szilágyi, Imre Miklós; Kótai, László
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 647:Issue 11(2021)
• Page Start: 1166
• Page End: 1174
• Publication Date: 2021-05-05
• Subjects: ammonium silver nitrate -- spectroscopy -- double salt -- hydrolysis -- thermal decomposition -- redox reaction; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.202100098
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract: The 1 : 1 type double salt of AgNO3 and NH4 NO3 (NH4 NO3 ⋅ AgNO3, compound 1 ) was prepared and its Raman spectrum was evaluated. IR and far‐IR spectra of compound 1 and its deuterated analog (ND4 NO3 ⋅ AgNO3, compound 1‐D ) were also studied. We identified two types of nitrate ions, one had a relatively strong, whereas the other is only weakly hydrogen bonded to the surrounding ammonium ions. The thermal decomposition features of compound 1 and its formation mechanism from [Ag(NH3 )2 ]MnO4 (compound 2 ) at 80 °C with consecutive aqueous leaching of the decomposition residue has been elucidated. The solid phase decomposition product of compound 2 is presumably [Ag(NH3 )NO3 ] (compound 3 ), which disproportionates into AgNO3 and [Ag(NH3 )2 ]NO3 (compound 4 ). Compound 4 thermally decomposes in the solid phase into Ag+MnO x, while in aqueous solution its hydrolysis results in NH4 NO3, which crystallizes out with an equimolar amount of AgNO3 formed during the disproportionation as compound 1 . Abstract :