Publisher DOI: 10.1080/02678292.2021.1873438
Title: Liquid crystalline hydrazones revisited: dipolar interactions vs hydrogen bonding affecting mesomorphic properties
Language: English
Authors: Knelles, Jakob 
Wanner, Chris 
Schulz, Finn 
Freund, Marcel 
Kolmangadi, Mohamed A. 
Baro, Angelika 
Huber, Patrick  
Schönhals, Andreas 
Laschat, Sabine 
Issue Date: 2021
Source: Liquid Crystals 48 (10): 1382-1391 (2021)
Abstract (english): 
In order to understand the role of dipolar interactions vs. H-bonding, a series of hydrazones were synthesised from 4-alkoxy-, 3,4-dialkoxy- or 3,4,5-trialkoxybenzaldehydes and phenyl, bromo- or nitrophenylhydrazine, respectively. Their mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarising optical microscopy (POM), X-ray diffraction (WAXS, SAXS) and compared with known members. Only those hydrazones derived from 3,4,5-trisalkoxybenzaldehyde and either meta, meta-dinitro- or ortho, para-dinitrophenylhydrazine displayed hexagonal columnar mesophases. All other derivatives were non-mesomorphic, even when H-bonds were present. Dipole moments of the various nitro-substituted hydrazones were experimentally determined by dielectric measurements and supported by theoretical DFT calculations, which indicated that the mesophase formation is mostly governed by strong dipole moment and further enforced by intramolecular H-bonding.
ISSN: 0267-8292
Journal: Liquid crystals 
Institute: Center for Integrated Multiscale Material Systems M-2 
Document Type: Article
Project: Ionische Flüssigkristalle in Nanoporösen Festkörpern: Selbstorganisation, molekulare Mobilität und elektro-optische Funktionalität 
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