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Spectroscopic characterization and room-temperature structure of bis(4-aminopyridinium) dichromate |
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| Authors: | R?Ben Smail |
| Institution: | 1.University of Carthage, Nabeul Preparatory Engineering Institute, University Campus,Nabeul,Tunisia;2.University of Tunis, Tunis Preparatory Engineering Institute,Montfleury, Tunis,Tunisia;3.University of Tunis El Manar, Faculty of Sciences of Tunis, Department of Chemistry, Laboratory of Materials, Crystallochemistry and Applied Thermodynamics, Farhat Hached University Campus,Tunis,Tunisia;4.Department of Chemistry,Goa University,Goa,India |
| Abstract: | Crystals of bis(4-aminopyridinium) dichromate (C5H7N2)2Cr2O7] (1) were isolated via slow solvent evaporation and characterized by energy dispersive spectroscopy (EDS), infrared (IR) and ultratviolet-visible (UV-Vis) spectroscopy, and single crystal X-ray diffraction. The room-temperature (RT; 298 K) phase of 1 crystallizes in the monoclinic space group P21/m. Its asymmetric unit consists of two crystallographically independent 4-aminopyridinium cations (A and B) and two halves of symmetry-independent dichromate anions (A and B). Cations and anions are linked with the aid of several moderate N–H?O hydrogen bonds and weak C–H?O interactions resulting in a three-dimensional supramolecular network. The crystal structure is further stabilized by extensive π–π stacking interactions between adjacent pyridine rings. A comparison of the structure of the RT phase of 1 and that of the low temperature (LT; 150 K) phase is described. |
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