An unexpected complex, triammine(oxalato)platinum(II) in which oxalate anion acts as a monodentate ligand, was isolated in the process of recrystallizing [Pt(NH3)4](C2O4). The complex was presumably formed via the loss of one ammonia molecule from [Pt(NH3)4](C2O4), followed by the binding of oxalate from the outer coordination sphere. Single crystal X-ray diffraction study revealed that the Pt(II) atom was coordinated on a distorted square by three N atoms of the ammine molecules and one O atom of the oxalate ligand. The crystal packing was stabilized by moderate to strong hydrogen bonds formed between ammine, water molecules and O atoms of oxalate with d(N···O) in the range of 2.84(2)–3.29(2) Å, and d(O···O) in the range of 2.86(2)–3.37(2) Å. The complex underwent thermal decomposition at 200–231 °C in the nitrogen atmosphere, giving rise to Pt, NH3 and CO2.
Research on Chemical Intermediates – Springer Journals
Published: Aug 11, 2011
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