 The halogen atoms in polysilicon dihalides can be substituted with organic groups.For example, (SiCl2)n undergoes substitution by alcohols to give poly(dialkoxysilylene)s. The polysilicon monohalides are all stable to 400°C, but are also water and air sensitive.Polysilicon monofluoride reacts more vigorously than the heavier polysilicon monohalides.