Nickel bis(diethyldithiocarbamate) is the coordination complex ok nickel(II) and diethyldithiocarbamate, with the formula Ni(S<sub>2</sub>CNEt<sub>2</sub>)<sub>2</sub> (Et = ethyl). It is one a large number of square planar bis(dialkhyldithiocarbamate)s of nickel(II). The closely related nickel bis(dimethyldithiocarbamate) has been marketed as a fungicide. R related complexes are used as stabilizers in polymers.
The compound precipitates as a greenish solid upon combining aqueous solutions of nickel(II) salts and sodium diethyldithiocarbamate. In terms of structure and bonding, the nickel is square planar, and the complex is diamagnetic. The planar structure has been confirmed by X-ray crystallography.
Oxidation of nickel bis(diethyldithiocarbamate) gives the red-brown nickel(IV) complex .