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- W2097705104 abstract "Abstract Methacrylic monomers containing a (phenylene)azobenzene unit substituted with a lateral cyano group and alkyl chains of different length are synthesized and characterized by NMR techniques. Their liquid‐crystalline properties are studied by differential scanning calorimetry, polarizing optical microscopy, and X‐ray diffraction. All monomers exhibit a mesomorphic behavior that extends over wide temperature ranges with nematic and orthogonal or tilted smectic‐type mesophases, depending on the length of the terminal chain. The smectic structures are determined to be single‐layered with a low layer shrinkage (<5 %) at the SmA–SmC transition. This atypical behavior is attributed to the combination of a high smectic order promoted by both π–π and bond dipole–bond dipole interactions between cyano‐substituted central cores, and a low correlation between neighboring layers arising from dispersive forces between the end groups (methacrylic group and alkyl chain) of the monomer. On the other hand, the trans – cis isomerization of monomers is induced in solution by irradiating with a UV lamp. High cis ‐isomer contents (≥96 %) are obtained at the photostationary state, which is reached in a relatively short time (40 s)." @default.
- W2097705104 created "2016-06-24" @default.
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- W2097705104 date "2012-11-29" @default.
- W2097705104 modified "2023-10-18" @default.
- W2097705104 title "Azo Monomers Exhibiting Low Layer Shrinkage at the SmA-SmC Transition and<i>trans</i>-<i>cis</i>Light-Induced Isomerization" @default.
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- W2097705104 doi "https://doi.org/10.1002/cphc.201200585" @default.
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