185993-19-5

Upstream product

• 5720-07-0 4-methoxyphenylboronic acid 
• 42545-43-7 2-(4-methoxyphenyl)thiophene 
• 29886-65-5 4-thiophen-2-yl-phenol 
• 124-38-9 carbon dioxide 
• 185993-18-4 3-(4-n0decylphenyl)thiophene 
• 147222-99-9 4-decyloxyphenylboronic acid 
• 30752-20-6 1-bromo-4-decyloxybenzene 

Relevant academic research and scientific papers

The synthesis and characterisation of a novel thiophene-based liquid crystal exhibiting ferro-, ferri- and antiferro-electric phase types

The synthesis and liquid crystal properties of (R)-(-)-4-(l-methylheptyloxycarbonyl)phenyl 5-(4-decyloxyphenyl)thiophene-2carboxylate is reported. This material exhibits the following phase types (°C): I 97.4 SA 92.2 Sc*81.4 ferri 78.8 antiferroelectric 48.6 glass state (characterised by thermal optical microscopy and differential scanning calorimetry). Results from electro-optical investigations, for example, field-induced transitions, temperature and voltage dependence and current and electro-optic response, clearly illustrate the presence of the Sc* ferro-, ferri- and antiferro-electric phase types.

Ferro-, ferri- and antiferro-electric behaviour in a bent-shaped mesogen

The synthesis of a novel bent-shaped, four-ring thiophene-based chiral liquid crystalline ester derived from 5-(4-n-decyloxyphenyl)thiophene-2- carboxylic acid and (S)-1-methylheptyl 4'-hydroxybiphenyl-4-carboxylate is reported, i.e., (S)-4'-(1-methylheptyloxycarbonyl)biphenyl-4-yl 5-(4-n- decyloxyphenyl)thiophene-2-carboxylate. Optical microscopy, differential scanning calorimetry, miscibility study, and complementary electro-optical and current response studies reveal the existence of the SmA*, SmC* ferroelectric, SmC* ferrielectric, SmC* antiferroelectric and SmI* antiferroelectric phase types. Another mesophase type possibly exists below SmI* antiferroelectric which generates a rapid electro-optic response. Comparison with the analogous three-ring compound, i.e., (S)-4-(1- methylheptyloxycarbonyl)phenyl 5-(4-n-decyloxyphenyl)thiophene-2-carboxylate increases the thermal stability by 95.8 °C and the SmI* antiferroelectric phase is observed in addition.