Nickel Chemistry: [6xfaster] Ni(I)

We already showed a lot of interesting Oxidation states. Now we will make one for Nickel having the oxidation state +I. Except for a few like Copper, M(I) is quite rare. Especially for Iron a lot of Fe(I) compounds were suggested which turned out to be false. Then there are the Nitroprusside-analogous compounds, often mentioned in books on Cyanide chemistry. Those Nitrosylcyanometallates(I) are often characterized as M(I) which would probably include the Fe one to have Fe(I) as well. Those new results we talked about in our video on the Nitrate test are of course more accurate than the old texts which mention those Nitrosylcyanometalltes(I) which is why I am quite careful here and the reason why we will not show them in future videos. Luckily there are other ways to make the Oxidation state +I. This time using Cyanide again. As the [Ni(CN)4](2-) containing Ni(II) is reduced using nascent Hydrogen the red, later dark Nickel(I)Cyanide precipitates. This is sometimes referred to be a Tricyanonickelate and literature is full of Tricyanometallates such as the Manganate (a dark green compound we will show soon). Usually this is just a shortened version of the true structure. Here it is in fact a dimer containing a real Nickel - Nickel - bond. The structure is: [Ni2(CN)6](4-) This can be further reduced using Potassium in liquid Ammonia....which we cannot do here of course to the [Ni(CN)4](4-) containing a Nickel(0). For Cyanides this is quite often the case, that the complex Cyanometallates are reduced using Potassium in Ammonia to the corresponding M(I) or M(0) compounds. A word to our method here. As we showed it quite often nascent Hydrogen forms if Al is dissolved in acids. Now it is not really favorable to treat Cyanides with Acid so we decided to use KOH instead. Aluminium reacts with KOH to form [Al(OH)4](-) and nascent Hydrogen which reduces the Nickel(II). Information to this experiment is from the book: Holleman Wiberg - Lehrbuch der Anorganischen Chemie We use this book quite often to explain compositions and structures. The idea to use nascent Hydrogen as reducing agent is from Woelen http://woelen.homescience.net/science...