THE FIRST CHROMATE CONTAINING BOTH Cr2O7 AND Cr3O10 GROUPS, bis(1,3-bis(4-PIPERIDINIUM)PROPANE) DICHROMATE TRICHROMATE MONOHYDRATE: SYNTHESIS AND CRYSTAL STRUCTURE
R. Ben Smail1,2, M.F. Zid2, A. Driss2
1University of Carthage, Nabeul, Tunisia
2University of Tunis El Manar, Tunis, Tunisia
Keywords: X-ray diffraction, crystal structure, dichromate trichromate, 1,3-bis(4-piperidinium)propane.
Abstract
A new organic-inorganic hybrid material (C13H28N2)2[Cr2O7][Cr3O10]×H2O (1) was synthesized by slow solvent evaporation at room temperature, and its crystal structure was determined by single crystal X-ray diffraction. This compound crystallizes in the monoclinic space group P21/c. The asymmetric unit contains two crystallographically independent 1,3-bis(4-piperidinium)propane, (H2bppp)2+ cations (A and B), one trichromate anion, one dichromate anion, and one water molecule. All these entities are interconnected into a complicated two-dimensional hydrogen bonded network via N-H⋯O and O-H⋯O hydrogen bonds. Furthermore, this structure is stabilized by a large number of C-H⋯O interactions, thus establishing a three-dimensional network structure. This compound appears to be the first example of chromates containing both Cr2O7 and Cr3O10 groups.
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