Dichlorodiiodomethane is a tetrahalomethane with the chemical formula . This organic compound is characterized by having four halogen atoms—two chlorine and two iodine—attached to a methane backbone.
Synthesis The compound was initially prepared by Höland in 1887 by treating with / at 100-200 °C for several weeks. Distillation gave dichloroiodomethane and dichlorodiiodomethane.
Physical properties The compound forms an unstable solid that melts and decomposes at 85 °C. Its heat of formation (−ΔH°F, 25 °C, gas phase) is −24 kcal·mol−1 (compare to 70 kcal·mol−1 for difluorodiiodomethane and −43 kcal·mol−1 for dibromodiiodomethane, calculated values). Its carbon-13 shift is −90.7 ppm.
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