Potassium trans-[bis(oxalato)diaquacobaltate(II)] tetrahydrate: synthesis, structure, potentiometric and thermal studies

作者：Chylewska Agnieszka^*; Sikorski Artur; Dabrowska Aleksandra; Chmurzynski Lech

来源：Central European Journal of Chemistry, 2013, 11(1): 8-15.

DOI：10.2478/s11532-012-0129-8

• Cobalt(II) complex
• Oxalate ligands
• X-ray
• Thermogravimetry
• Potentiometry

The title compound, trans-K-2[Co(C2O4)(2)(H2O)(2)]center dot 4H(2)O, was synthesised, and characterised by elemental analysis. Acid dissociation constants for the complex were determined by potentiometric titration and calculated by STOICHIO program. The crystal structure of trans-K-2[Co(C2O4)(2)(H2O)(2)]center dot 4H(2)O was determined by X-ray diffraction studies. The asymmetric part of the unit cell contains one symmetric anion of oxalate and water molecule bound with Co(II) ion in crystallographic special position, one potassium cation and two molecules of water. Thermal properties of the complex were examined by thermogravimetric analysis (TGA). A decomposition mechanism is proposed on the basis of the results.

• 出版日期2013-1