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A family of dyes useful for guest-host liquid crystal displays is deriv from tetracyanoethylene.
English (United States)
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Dyes for Liquid Crystal Displays
A family of dyes useful for guest-host liquid crystal displays is deriv from
The chemistry for preparing these dyes is quite general and is outlined in the
The reaction proceeds at room temperature in solvents, such as
tetrahydrofuran, to give near quantitative yields. In order to drive the reaction to
the para position, one of the R groups must be alkyl. Compounds of type I are
intensely colored, due to a strong internal charge transfer contribution between
the electron-deficient and -rich regions of the molecule.
The present family of dyes has absorption maxima around 500 am and
extinction coefficients in excess of 50,000. The optical and molecular structure of
this class of dyes is suited for liquid crystal display applications.