Tris(2-methylpiperidinium) tetrachloridoferrate dichloride

The asymmetric unit of the title salt, (C6H14N)3[FeCl4]Cl2, consists of a tetrahedral tetrachloroferrate anion, three independent 2-methylpiperidinium cations and two chloride ions. All the piperidine rings adopt chair conformations. In the crystal, the organic cations and the free chloride anions are linked into chains parallel to the a axis by N—H⋯Cl hydrogen bonds.

The asymmetric unit of the title salt, (C 6 H 14 N) 3 [FeCl 4 ]Cl 2 , consists of a tetrahedral tetrachloroferrate anion, three independent 2-methylpiperidinium cations and two chloride ions. All the piperidine rings adopt chair conformations. In the crystal, the organic cations and the free chloride anions are linked into chains parallel to the a axis by N-HÁ Á ÁCl hydrogen bonds.
Unfortunately, the study carried out on the title compound indicated that the permittivity is temperature-independent, suggesting that there may be no dielectric disuniformity between 80 K to 350 K (m.p. 393-381 K). In this report the crystal structure of the title compound is reported.

Experimental
An aqueous solution of 2-methylpiperidine (1.64 g, 20 mmol) and hydrochloric acid (10 mmol) was treated with FeCl 3 (1.75 g, 10 mmol). After the mixture was churned for a few minutes, slow evaporation of the resulting solution yielded yellow crystals after a few days.

Refinement
Hydrogen atom positions were placed at calculated positions and allowed to ride on their parent atoms, with C-H = 0.96-0.97 Å, N-H = 0.90 Å, and with U iso (H) = 1.2U eq (C, N) or or 1.5 U eq (C) for methyl H atoms.  The molecular structure of the title compound with displacement ellipsoids drawn at the 30% probability level. Dashed lines indicate hydrogen bonds.

Figure 2
Crystal packing of the title compound viewed along the a axis. Dashed lines indicate hydrogen bonds.

Tris(2-methylpiperidinium) tetrachloridoferrate dichloride
Crystal data (C 6   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.