Photoinduced circular anisotropy has been demonstrated in thin films of a main-chain polymeric liquid crystal (PLC) system doped with photochromic W-shaped molecules containing two azobenzene groups by irradiating with circularly polarized light (CPL). Reversible photoinduced circular dichroism (CD) was observed with sign relevant to the handedness of the CPL. The experimentally observed CD spectra were analyzed using the DeVoe polarizability model associated with the coupled oscillator method. We also propose a mechanism for the photoinduced circular anisotropy in our system; nucleating the W-shaped molecules with preferential twisted conformation by CPL irradiation, and triggering the local formation of a chiral structure in the W-shaped-molecule-doped main-chain PLC medium.
Chirale Polyimidoberflächen führen zu endlicher Enantioselektivität in der B4‐Phase achiraler bananenförmiger Mesogen‐Moleküle (siehe Mikroskopiebild). Ein ee‐Wert von 10 % wurde mithilfe geriebener chiraler Polyimidoberflächen erzielt. Diese Technik weist den Weg zu neuen Möglichkeiten, die Chiralität in chemischen und biologischen Systemen einzustellen.
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