Synthesis, structure determination and characterization by UV–Vis and IR spectroscopy of bis(diisopropylammonium) <i>cis</i>-dichloridobis(oxalato-κ<sup>2</sup> <i>O</i> <sup>1</sup>,<i>O</i> <sup>2</sup>)stannate(IV)
Acta crystallographica. Section E, Crystallographic communications