Скачать или смотреть Ruthenium Chemistry: RuO4 + NaBH4 (RuO2) (?)

According to literature RuO4 (Ru=8), [RuO4](-) (Ru=7) and [RuO4](2-) (Ru=6) will react with Borohydrides to form a dark blue RuO2.
In the video we added Sodium Borohydride (NaBH4) to an aqueous solution of RuO4, it immediately turned dark blue-black with gas evolution.
There are two characteristic dark insoluble Ruthenium compounds, the Ru(III)oxide and Ru(IV)oxide. The latter one is blue due to impurities with Ru(III) and Ru(II) (at least this is the common explanation) so it might be a mixture of more than one oxidation state including Ru(III) and Ru(IV)…pretty much the same as the commercial chloride with a higher oxygen concentration.
As we will also try to make Ru2O3 soon we will accept this compound here to be RuO2. It will crystallize in a so called Rutile-structure, one of the more common ways MO2 compounds can crystallize.