Dione (3)

C₂O₂, Ethene-1,-2-dione (or dicarbon dioxide) is our third and final example of ‘dione’. Image uploaded and kindly reproduced according to the licence at: http://en.wikipedia.org/wiki/File:Dicarbon-dioxide-3D-balls.png

The molecule is a hypothetical one, although recent research indicates that it may be temporarily formed before decomposing into two CO molecules (C₂O₂ –> 2CO) – however, it is estimated to exist for only 10^-8 of a second.

More can be read here: http://en.wikipedia.org/wiki/Ethylene_dione