Partially Fluorinated Aliphatic Units

Another possibility for achieving attractive interactions due to fluorination could be provided by partial fluorination of aliphatic hydrocarbons. If H and F are combined at one C atom the highly polar nature of the C-F bond can cause polarization of the C-H bond at the same carbon, thus enabling attractive interactions with fluorine atoms at neighboring molecules. For example, difluoromethane has a significantly higher boiling point (—52°C) than either methane (—161°C) or tetrafluoromethane (—128°C) [59, 421], 

Poly(vinylidene fluoride) with the sequence (CF2-CH2)n is a well known ferroelectric polymer in the crystalline state where the chains adopt an all-trans conformation [424]. This structure could provide interesting properties if used as building block of LC. 

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