Can iodine hydrocarbons be used as fire extinguishing agent? What are their properties?

In the German Wikipedia the following claim about fire extinguishing agents is made:



> 
> Iodkohlenwasserstoffe haben zwar eine hervorragende Löschwirkung,
>  erlangten wegen ihres exorbitant hohen Preises (in den 1950ern etwa
>  Faktor 10 gegenüber Bromkohlenwasserstoffen) jedoch niemals Bedeutung.
> 
> 
> 


Translated:



> 
> Though iodine hydrocarbons have excellent fire extinguishing properties
>  they never became important because of their exorbitant prices (during
>  the 1950s they were approximately 10 times more expensive than bromide
>  hydrocarbons).
> 
> 
> 


Now I am curious because I never heard of iodine hydrocarbons. What are their properties and what advantages would they have over the traditional halogen (fluoride, chloride, bromide) components if price is irrelevant?


