2-Methylpiperidinium bromide

In the title organic–inorganic hybrid salt, C6H14N+·Br−, N—H⋯Br hydrogen bonds link the cations and anions, forming extended hydrogen-bonded chains along the c axis.

In the title organic-inorganic hybrid salt, C 6 H 14 N + ÁBr À , N-HÁ Á ÁBr hydrogen bonds link the cations and anions, forming extended hydrogen-bonded chains along the c axis.
Unfortunately,the dielectric constant of the title compound as a function of temperature indicates that the permittivity is basically temperature-independent below the melting point of the compound (428-429K). We have found that title compound has no dielectric disuniformity from 80 K to 405 K. Herein we descibe the crystal structure of this compound.
Regarding its crystal structure, the asymmetric unit of the title compound consists of a 2-methylpiperidinium cation and a bromide anion (Fig. 1). The cations and anions are connected by N-H···Br hydrogen bonds, which make a great contribution to the stability of the crystal structure ( Fig. 2 and Table 1).

Experimental
The title compound was obtained by the addition of hydrobromic acid (0.8 g, 0.01 mol) to a solution of 2-methylpiperidine (0.97 g, 0.01 mol) in water, i.e., in the stoichiometric ratio of 1:1. Good quality single crystals were obtained by slow evaporation of water after two days (the chemical yield is 65%).

Refinement
All H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms with C-H = 0.97-0.98 Å, N-H = 0.90 Å and with U iso (H) = 1.2U iso (C, N) and U iso (H) = 1.5U iso (C) for methyl hydrogen atoms.

Figure 2
A view of the packing of the title compound along the a axis. Dashed lines indicate hydrogen bonds. where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max = 0.001 Δρ max = 0.38 e Å −3 Δρ min = −0.48 e Å −3 Extinction correction: SHELXL97 (Sheldrick, 2008), Fc * =kFc[1+0.001xFc 2 λ 3 /sin(2θ)] -1/4 Extinction coefficient: 0.0022 (5) Special details Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. 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.