Cyanomethanaminium perchlorate

In the crystal of the title salt, C2H5N2 +·ClO4 −, the cations and anions are connected via N—H⋯O and C—H⋯O hydrogen bonds, forming a three-dimensional network.

In the crystal of the title salt, C 2 H 5 N 2 + ÁClO 4 À , the cations and anions are connected via N-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds, forming a three-dimensional network.
Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL. At present, much attention in ferroelectric material field is focused on developing ferroelectric pure organic or inorganic compounds (Haertling, 1999;Homes et al., 2001). In order to find more dielectric ferroelectric materials, we investigate the physical properties of the title compound (Fig. 1). The dielectric constant of the title compound as a function of temperature indicates that the permittivity is basically temperature-independent (dielectric constant equaling to 3.7 to 5.2), suggesting that this compound should be not a real ferroelectrics or there may be no distinct phase transition occurred within the measured temperature range. Similarly, below the melting point (453 K) of the compound, the dielectric constant as a function of temperature also goes smoothly, and there is no dielectric anomaly observed (dielectric constant equaling to 3.7 to 5.2). Herein, we report the synthesis and crystal structure of the title compound.
Molecules of the title compound have normal geometric parameters. The bond lengths and angles are within their normal ranges (Han & Zhang, 2010). As can be seen from the packing diagram (Fig. 2), molecules are connected via intermolecular N-H···O and C-H···O hydrogen bonds to form a three dimensional network.

Experimental
A mixture of aminoacetonitrile hydrochloride (0.095 g, 0.01 mol) and perchloric acid (1.40 g, 0.01 mol) in methanol (20 ml) was stirred until clear. After several days, the title compound was formed and recrystallized from solution to afford colourless prismatic crystals suitable for X-ray analysis.

Refinement
H atoms were positioned geometrically and refined using a riding model with C-H = 0.97 and N-H = 0.89 Å, U iso (H) = 1.2U eq (C) and 1.5U eq (N).

Figure 2
The crystal packing of the title compound viewed along thea axis showing the hydrogen bondings network. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.