Abstract
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) Å3. In the title salt, (C7H11N2)2CuCl4, both 4-dimethylaminopyridinium cations are protonated at their pyridine N atoms. The geometry of the CuCl2-4 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.
Highlights
Non-covalent interactions, such as hydrogen bonding and π-π stacking, play a very prominent role in the organization of structural units in both biochemistry and material science [1]-[3]
CuCl2∙2H2O (1 mmol; 0.17 g) was added to a 4-dimethylaminopyridine (1 mmol; 0.12 mL) solution dissolved in 15 mL of absolute ethanol
Crystal Structure The structure of the title compound consists of discrete CuCl24− anions and 4-dimethylaminopyridinium cations (Figure 1)
Summary
Non-covalent interactions, such as hydrogen bonding and π-π stacking, play a very prominent role in the organization of structural units in both biochemistry and material science [1]-[3]. These weak interactions exercise important effects on the architecture and properties of many materials in various fields such as biology [4] [5] and crystal engineering [6] [7]. Some studies have examined how metal halide oligomers can be tied together via pyridinium derivative cations into chains, layers, etc. It is well-know that organic-inorganic materials with pyridine and its derivatives as template agents have led to the preparation of some materials with interesting physical properties [12]-[16] and biological activities [17]-[19]
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