Oxygenversusnitrogen interactions in lithium dinitramidate dihydrate and pyridinium dinitramidate
摘要:
The title compounds, diaquadinitramidatolithium(I), [Li( N3O4)(H2O)(2)], (I), and pyridinium dinitramidate, C5H6N+ center dot N3O4-, (II), differ significantly in their cation-anion contacts. The Li+ atom of (I) is coordinated by two O atoms of the dinitramide anion in a chelate and by four additional water molecules, with the Li and central N atom of the anion on a twofold rotation axis. The pyridinium cation of (II) exhibits a contact with the dinitramide anion via an intermolecular N-H center dot center dot center dot N hydrogen bridge. These interactions are compared with those found in reported anhydrous lithium dinitramide and ammonium dinitramide salts.
The preparation and physicochemical properties of salts of dinitramide HN(NO2)(2) with uni- and bivalent metals of groups I, II, VII, and VIII of the Periodic Table are considered.
The literature known, but not fully characterized, silver dinitramide transfer reagents AgN(NO2)(2) (1), [Ag(NCCH3)]-[N(NO2)(2)] (2), and [Ag(py)(2)][N(NO2)(2)] (3) have been investigated by Ag-109, N-14 NMR and vibrational spectroscopy (IR, Raman). In addition, the poorly understood [Cu(NH3)(4)][N(NO2)(2))](2) (4) and [Pd(NH3)(4)][N(NO2)(2)](2), (5) have also been prepared and characterized by N-14 NMR and vibrational spectroscopy (IR, Raman). The structures of 2-5 have also been determined by X-ray diffraction.