Carbon dichalcogenide

Carbon dichalcogenides are chemical compounds of carbon and chalcogen elements. They have the general chemical formula CZ₂, where Z = O, S, Se, Te.
This includes:

Stability

Double bonds between carbon and chalcogen elements, C=Z, become weaker the heavier the chalcogen, Z. This trend means carbon dichalcogenide monomers are less stable and more susceptible to polymerisation as Z changes from O to Te. For example, is stable, polymerises under extreme conditions, tends to polymerise, CSeTe is unstable and does not exist. This trend is an example of the double bond rule.

In carbon dichalcogenides, C=O bond lengths are around 1.16 Å, C=S around 1.56 Å, C=Se around 1.70 Å and C=Te around 1.90 Å.