Infrared spectra of inorganic phosphorus compounds

Vibrational analysis of Ag3(PO2NH)3, Na3(PO2NH)3.H2O, Na3(PO2NH)3.4H2O, [C(NH2)3]3(PO2NH)3.H2O and (NH4)4(PO2NH)4.4H2O

“…Na 3 (PO 2 NH) 3 [23]. For the preparation of (NH 4 ) 4 (PO 2 NH) 4 .4H 2 O (compound V), the starting material H 4 (PO 2 NH) 4 .2H 2 O was obtained according to the literature [6] by hydrolysis (333 K, 48 h) of (PNCl 2 ), in dioxane. Then an aqueous solution of ammonia (10%) is added to a stoichiometric amount of the acid followed by precipitation with acetone [24].…”

“…The trimetaphosphimate anion (PO 2 NH) 3 3 − and tetrametaphosphimate anion (PO 2 NH) 4 4 − exhibit chair conformation, but in compound I the anion is markedly distorted because of the interaction between Ag + and one nitrogen atom of the anion [21]. The (PO 2 NH) 3 3 − ring has C 3v symmetry [13] and the (PO 2 NH) 4 4 − ring has C 2h symmetry [15].…”

“…These compounds have been mainly characterized by IR spectroscopy [3,4] and X-ray powder diffraction [5]. Extensive amount of work has been done on the study of the characteristic features of the coordination of metaphosphimate anions by vibrational spectroscopy, involving the calculation of wavenumbers and forms of the normal vibrations [6][7][8][9][10][11][12][13][14][15][16].…”

“…In this chapter a report of the analysis of both the IR and Raman spectra of Ag 3 (PO 2 NH) 3 3 .H 2 O (compound IV) and (NH 4 ) 4 (PO 2 NH) 4 .4H 2 O (compound V) is made. The Raman spectra of these samples in aqueous solution are also recorded to clear the ambiguity regarding certain vibrations.…”

“…

AbstractFT IR and FT Raman spectra of Ag 3 (PO 2 NH), (Compound I), Na 3 (PO 2 NH) 3 4 .4H 2 O (Compound V) are recorded and analyzed on the basis of the anions, cations and water molecules present in each of them. The PO 2 NH − anion ring in compound I is distorted due to the influence of Ag + cation.

…”