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5

It is not common to find the ferrous ferrocyanide because it oxidizes rapidly. As you can see the remaining salts or pigments are pretty stable in air. This one is white. I quote from a very old Analytical Chemistry book by Treadwell, pg. 155, this should address your query. It states: Potassium Ferrocyanide, $\ce{K4[Fe(CN)6]}$, produces in solutions of ...

2

Chelate complexes are more stable IF EVERYTHING ELSE IS THE SAME. In your case, the anionic nature(cf. ethylenediamine is neutral) of cyanide makes cyanide a better sigma-donor than is ethylenediamine, while the pi-accepting nature(cf. ethylenediamine is pi-neutral, if not (hyperconjugative) pi-donating) of cyanide makes cyanide a better pi-acceptor than is ...

1

According to PubChem, the IUPAC name of nickel bis(glycinate) is carboxymethylazanide;nickel(2+), which has a given structure of: However, according to suggestions in Ref.1, the correct IUPAC name should be bis[glycinato(2-)-$\kappa^2$N,O]nickel. Since the complex is simply given as $\ce{[Ni(gly)2]}$, it is no need to go for the compllicated name since I ...

1

I'm not sure if coordination bonds as such are defined in the connectivity table in .sdf. Perhaps the original definition by MDL (back when operative)/Symyx have a line about this (still available from archive.org's snapshots by their Wayback Machine e.g., here).* While currently not functional for me, RDKit's cookbook includes a relevant entry to this, ...

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