Synthesis and characterization of liquid crystals containing a non-activated 1',3',3'-trimethylspiro[2H-1-benzopyran-2,2-indoline] group

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Abstract
Two series of mesogens derived from the non-activated spiropyran dyes 6-hydroxy-1,3,3-trimethylspiro[2H -1-benzopyran-2,2-indoline] (series trimethylspiro[2 H -1-benzopyran-2,2-indoline] (series 2) have been synthesized. Analysis by differential scanning calorimetry, polarizing microscopy and X-ray diffraction showed compounds in series 1 form monotropic nematic and SmA phases, while compounds in series 2 form only a monotropic nematic phase.