Ni(Cn)42

The compound Ni(CN)4^2- is a coordination complex consisting of a central nickel ion coordinated with four cyanide ligands. The coordination geometry around the nickel ion is tetrahedral. The cyanide ligands act as strong pi acceptors, which allows the nickel ion to achieve a stable d8 electronic configuration through backbonding.

The compound is soluble in water and exhibits a green color due to its absorption spectrum, which is caused by the presence of cyanide ligands. The complex has a high stability constant, which makes it a useful reagent in analytical chemistry and electroplating applications.

It is important to handle this compound with care, as cyanide ligands are toxic and can form deadly hydrogen cyanide gas upon contact with acids. Proper ventilation and personal protective equipment should be used when working with this compound.