1-(2,3-Dimethylphenyl)piperazine-1,4-diium tetrachloridocuprate(II)

In the title salt, (C12H20N2)[CuCl4], the CuII atom occupies a general position in a flattened tetrahedral environment by Cl ligands, characterized by Cl—Cu—Cl angles of 134.04 (3) and 137.18 (4)°. The six-membered piperazinediium ring adopts a chair conformation. The organic cation and inorganic anion interact through N—H⋯Cl and C—H⋯Cl hydrogen bonds, forming a three-dimensional network.

In the title salt, (C 12 H 20 N 2 ) [CuCl 4 ], the Cu II atom occupies a general position in a flattened tetrahedral environment by Cl ligands, characterized by Cl-Cu-Cl angles of 134.04 (3) and 137.18 (4) . The six-membered piperazinediium ring adopts a chair conformation. The organic cation and inorganic anion interact through N-HÁ Á ÁCl and C-HÁ Á ÁCl hydrogen bonds, forming a three-dimensional network.  (2007). For general background to the geometry of the tetrahalidocuprate(II) species, see: Halvorson et al. (1990). For puckering parameters, see: Cremer & Pople (1975).
However we can tell that the configuration adopted by this anion is a flattened tetrahedral where the two trans bond angles, Cl(1)-Cu-Cl(4) = 137.18 (4)° and Cl (2)

Experimental
To an aqueous solution (10 ml) of HCl (0.2M) was added 1-(2,3-dimethylphenyl)piperazine (0.19 g, 1 mmol). To the obtained solution, a blue aqueous solution (10 ml) of CuCl 2 .6H 2 O (0.170 g, 1 mmol) was added slowly with stirring. The resulting solution was submitted to a slow evaporation at room temperature until the formation of yellow crystals of the title compound.

1-(2,3-Dimethylphenyl)piperazine-1,4-diium tetrachloridocuprate(II)
Crystal data (C 12  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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq