Articles written in Journal of Chemical Sciences
Volume 127 Issue 8 August 2015 pp 1427-1433 Regular Articles
A new hybrid salt (C5H9N2)[Cr(C2O4)2 (H2O)2].3H2O, 3,5-dimethylpyrazole Cis diaquadioxala-tochromate(III) trihydrate, has been prepared by slow evaporation at room temperature and characterized by single crystal X-ray diffraction, IR, UV–visible spectroscopies, PXRD and thermogravimetric analyses. Furthermore, the observed crystal morphology was compared to the simulated one using the Bravais-Friedel, Donnay-Harker model. The structure of the title compound consists of [Cr(C2O4) 2 (H2O) 2]− mononuclear anions, 3,5-dimethylpyrazole cations and three uncoordinated water molecules. The Cr3+ ion is six coordinated in a slightly distorted octahedral environment, by two O atoms from two water molecules and four O atoms of two oxalate anions acting as chelating ligands. The cohesion of the structure is established by intermolecular O–H...O, N–H...O hydrogen bonds which connect ionic entities and water molecules and also by 𝜋–𝜋 stacking interactions between the rings of 3,5-dimethylpyrazole cations. Hence, both coordinated and uncoordinated water molecules play an important role in the hydrogen-bonding system and stabilize the structure.
Volume 132, 2019
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode