The crystal structure of compounds with (N–P)_nrings. II. Sodium trimetaphosphimate tetrametaphosphimic acid dihydrate

Trisodium Trimetaphosphimate Monohydrate

“…These compounds have been mainly characterized by IR spectroscopy (Pustinger, Cave & Nielsen, 1959) and powder diffraction (Herzog & Nielsen, 1958). In contrast to H3(PO2NH)3.2H20 and (NH4)H2(PO2NH)3.CH3OH , where the P-N rings show a distorted boat conformation (Olthof, Migchelsen & Vos, 1965), the title compound, (I) (Fig. 1), Na3(PO2NH)3.4H20 and (NHn)3(PO2NH)3.H20 exhibit distorted chair conformations (Attig & Mootz, 1976;Stock & Schnick, 1996).…”

“…As may be seen from the bond lengths and valence angles, the phosphimate ring in Na3(PO2NH)3.H20 exhibits approximate 3m symmetry. Whereas in (NH4)3(PO2NH)3.H20 and Na3(PO2NH)3.4H20, threedimensional networks of (PO2NH) The starting material, Na3(PO2NH)3.4H20, was obtained Na4 according to Nielsen & Morrow (1960) by reaction (12h, OIA 323 K) of 3 g Na(OOCCH3).3H20 in 48 ml water with 6 g OlB (PNC12)3 in 24ml dioxane. Whereas the authors claim the O2A…”

Tetraammonium Tetrametaphosphimate Tetrahydrate

“…Structural information from single-crystal X-ray investigations are only available for H4(PO2NH)a.2H20 (Migchelsen et al, 1965;Attig & Mootz, 1977), K4(PO2NH)a.4H20, Csa(PO2NH)a.6H20 (Berking & Mootz, 1971) and K4(H30)Tm[(PO2NH)4]2.6H20 (Sokol et al, 1982). This poor level of information about tetrametaphosphimates contrasts with the well investigated structural chemistry of tetrametaphosphates (Durif, 1995) and the recently characterized crystal structures of some trimetaphosphimates (Stock & Schnick, 1996, 1997a which are useful starting materials in the synthesis of transition metal complexes (Sokol et al, 1982) and oxo-nitrido phosphates (Feldman, 1983).…”

Tetrametaphosphimic acid dihydrate, a redetermination

“…The structure of (NHPOEH)4.2H20 was first described by Migchelsen, Olthof & Vos (1965). Because of insufficient material the study was of limited accuracy.…”

“…The atomic form factors of Hanson, Herman, Lea & Skillman (1964) were used for P, O and N, those of Stewart, Davidson & Simpson (1965) for H.* Discussion. A discussion of the packing and bonding effects in this structure has been given (Migchelsen, Olthof & Vos, 1965). Therefore, only differences which depend on the higher accuracy of this study will be described here.…”