Author(s)

Mahjouba Ben Nasr¹, Frédéric Lefebvre², Chérif Ben Nasr^1*

¹Laboratoire de Chimie des Matériaux, Faculté des Sciences de Bizerte, Université de Carthage, Zarzouna, Tunisie.
²Laboratoire de Chimie Organométallique de Surface (LCOMS), Ecole Supérieure de Chimie Physique Electronique, Villeurbanne, France.

The chemical preparation, crystal structure and spectroscopic characterization of a novel organic-inorganic hybrid material, bis(4-dimethylaminopyridinium) tetrachlorocuprate, have been reported. This compound crystallizes in the monoclinic system in space group C2/c and cell parameters a = 12.4356 (18), b = 12.0901 (17), c = 14.094 (2) Å, β = 115.303 (2)°, Z = 4 and V = 1915.8 (5) ų. In the title salt, (C₇H₁₁N₂)₂CuCl₄, both 4-dimethylaminopyridinium cations are protonated at their pyridine N atoms. The geometry of the CuCl^2-₄ ions is intermediate between tetrahedral and square planar. The atomic arrangement can be described by an alternation of inorganic layers built up by tetrachlorocuprate anions and organic layers formed by 4-dimethylaminopyridinium cations. The organic layers are located in sandwich between the inorganic layers. The anionic and cationic layers are held together by N-H···Cl and C-H···Cl hydrogen bonds into a three-dimensional network. The individual cations are π-π stacked with their neighbors at a distance of 3.7622 (5) Å. The vibrational absorption bands were identified by infrared spectroscopy and DFT calculations allowed their attribution.

Crystal Structure, 4-Dimethylaminopyridine, Hydrogen Bonds, π-π Interactions, DFT Calculations

Ben Nasr, M. , Lefebvre, F. and Ben Nasr, C. (2015) Synthesis, Crystal Structure and Infrared Characterization of Bis(4-dimethylamino-pyridinium) Tetrachlorocuprate. American Journal of Analytical Chemistry, 6, 446-456. doi: 10.4236/ajac.2015.65044.