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Upstream product

• 119897-09-5 2,7-naphthalene bis(4-hydroxybenzoate) 
• 317819-66-2 C₃₈H₂₈O₆ 
• 4861-61-4 2-dodecylthiophene 
• 1486-50-6 4-(benzyloxy)benzoic acid chloride 
• 1486-51-7 p-(benzyloxy)benzoic acid 
• 143-15-7 1-dodecylbromide 
• 123-08-0 4-hydroxy-benzaldehyde 
• 1250377-52-6 4-formylphenyl 5-dodecylthiophene-2-carboxylate 
• 582-17-2 2,7-Dihydroxynaphthalene 
• 1250377-53-7 4-(5-dodecylthiophene-2-carbonyloxy)benzoic acid 

Relevant academic research and scientific papers

Bent-core mesogens with thiophene units

Bent-core mesogens with thiophene and 2,2′-bithiophene units at the periphery of the aromatic core were synthesized and investigated by polarizing microscopy, XRD and electrooptical methods. Resorcinol, 2,7-naphthalenediol and 3,4′-biphenyldiol were used as bent units, phenyl thiophene-2-carboxylates form the rod-like wings and n-alkyl chains as well as olefin- and silylated-terminated alkyl chains were attached as flexible end-groups. A broad variety of different mesophase structures, incorporating ferroelectric and antiferroelectric switching smectic as well as modulated smectic phases, was obtained. Compared with the corresponding benzoates, these thiophene derived compounds form nearly identical LC phase structures, but have significantly reduced transition temperatures, which make them advantageous for applications.

The effect of a thiophene ring in the outer position on mesomorphic properties of the bent-shaped liquid crystals

Novel bent-shaped compounds with the naphthalene central core possessing an outer thiophene unit in the lengthening arm were synthesized. Mesomorphic behaviour of new materials was studied using optical polarising microscopy, DSC, and electrooptic methods. The structures of mesophases were identified by X-ray diffraction and the structural parameters established. In the case of the thiophene unit in one molecular arm (the phenyl in the opposite arm) we succeeded in obtaining mesogenic properties for all types of lateral substitutions on the central naphthalene core. All non-substituted compounds and materials with the central core substituted by CH3 or Cl exhibited the B2 phase. The B7 phase has been observed for all compounds with CN-substituted central core. Materials with the thiophene unit in both lengthening arms were not liquid crystalline except for the CN-substituted compound exhibiting the B7 phase. Mesomorphic properties of compounds with the thiophene are compared with those detected on analogous materials with the phenyl ring.