tert-Butylaminium phosphite

In the title compound, C4H12N+·H2PO3 −, the components are linked by intermolecular N—H⋯O and O—H⋯O hydrogen bonds, resulting in a two-dimensional framework.

In the title compound, C 4 H 12 N + ÁH 2 PO 3 À , the components are linked by intermolecular N-HÁ Á ÁO and O-HÁ Á ÁO hydrogen bonds, resulting in a two-dimensional framework.

Structure Reports Online
In the title compound, (Fig. 1), the bond lengths and angles (Table 1) are generally within normal ranges (Smolin et al., 2003). The NH 3 group of alkyl is additionally protonated by an H atom of the phosphite ion to give a positively charged molecule. The phosphite ion is shaped like a tetrahedron. The H1P atom is localized at the P atom at a distance of 1.278 (19) Å, which is not involved in hydrogen bonding. The O2-P1 [1.5708 (15) Å] bond is significantly longer than the other P-O bonds of the tetrahedron (Table 1). Phosphite and amine molecules are linked by intramolecular N-H···O hydrogen bonds (Table 2).
In the crystal structure, intermolecular N-H···O and O-H···O hydrogen bonds (Table 2) link the molecules (Fig. 2). Each two orthophosphorous acids are linked by O-H···O hydrogen bonds into channels, while the orthophosphorous acids and amine molecules are linked by N-H···O hydrogen bonds into chains. Then, the chains are linked by N-H···O and O-H···O hydrogen bonds into a two-dimensional framework, as in the phosphates reported by Smolin (Smolin et al., 2003), in which they may be effective in the stabilization of the structure.

Experimental
The title compound was prepared by the reaction of phosphorous acid (0.164 g, 2.0 mmol) and tert-butylamine (0.182 g, 2.5 mmol) stirred in water/ethanol (5:1 v/v) solution (20 ml). Single crystals suitable for X-ray analysis were obtained by recrystallization from water/ethanol (5:1 v/v) solution at room temperature over a period of 3 d.

Refinement
H1N, H2N, H3N (for NH 3 ), H10 (for OH) and H1P (for PH) were located in difference synthesis and refined isotropically  Fig. 1. The molecular structure of the title molecule with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level.