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Liquid crystals v.20 no.6, 1996년, pp.741 - 749  

Modulating the spontaneous polarization of a ferroelectric liquid crystal via the photoisomerization of a chiral thioindigo dopant: (R,R)-6,6'-bis(1-methylheptyloxy) thioindigo

Dinescu, Liviu ; Lemieux, Robert P. ;
  • 초록  

    Doping the novel chiral photochromic dye (R,R)-6,6'-bis(1-methylheptyloxy) thioindigo into the Sc liquid crystal host MX6120 at a concentration of 7.2 mol % gives rise to a ferroelectric S*c phase with a reduced polarization (P0) of +14.4 nCcm-2. Results of time-resolved experiments demonstrate that the dye undergoes trans → cis photoisomerization in the Sc phase, although the efficiency of photoisomerization is significantly lower than in the nematic and isotropic liquid phases. A reversible modulation of Ps on the order of 10 per cent is observed for the doped S*c phase upon photoisomerization of the dye from a thermally relaxed trans form (+6.2 nC cm-2) to a cis-enriched photostationary state (+5.6 nC cm-2) at T - Tc = -10°C. Control experiments using mixtures of the racemic and optically active dye in a S*c host suggest that Ps photomodulation does not arise from a photomechanical effect. Consideration of the Boulder model for the molecular origins of Ps provides a rationale for the observed Ps photomodulation based on changes in the conformational equilibria of the 1-methylheptyloxy side-chains in the Sc binding site going from the trans form to the cis form of the thioindigo dopant.


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