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A series of new liquid crystalline compounds containing a mono-aza styrylated indolinobenzospiropyran, 1a-1d, has been synthesized. The synthesized LC dyes are subjected to thermal analysis on a differential scanning calorimeter (DSC), to texture of phases on a polarizing microscope and electro-optical system. All compounds examined in the series are monotropic and have relatively low mp's (125-128...
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