Diiodoacetylene is the organoiodine compound with the formula . It is a white, volatile solid that dissolves in organic solvents. It is prepared by iodination of trimethylsilylacetylene. Although samples explode above 80 ðC, diiodoacetylene is the most readily handled of the dihaloacetylenes. Dichloroacetylene, for example, is more volatile and more explosive. As confirmed by X-ray crystallography, diiodoacetylene is linear, with the structure . It is however a shock-, heat-, and friction-sensitive compound. Like other haloalkynes, diiodoacetylene is a strong halogen bond donor.