90619-88-8

Basic information

• Product Name: 2-Thiophenecarboxylic acid, 5-octyl-
• Synonyms: 5-Octyl-2-thiophencarbonsaeure;2-Thiophenecarboxylic acid,5-octyl;5-Octyl-2-thiophenecarboxylic acid
• CAS NO: 90619-88-8
• Molecular Formula: C13H20O2S
• Molecular Weight: 240.36200
• Mol File: 90619-88-8.mol
• Article Data: 4

Chemical Properties

• CAS DataBase Reference: 2-Thiophenecarboxylic acid, 5-octyl-(CAS DataBase Reference)
• NIST Chemistry Reference: 2-Thiophenecarboxylic acid, 5-octyl-(90619-88-8)
• EPA Substance Registry System: 2-Thiophenecarboxylic acid, 5-octyl-(90619-88-8)

Safety Data

• Hazardous Substances Data: 90619-88-8(Hazardous Substances Data)

Upstream product

• 111-83-1 1-bromo-octane 
• 73792-02-6 5-octyl-2-thiophenecarboxaldehyde 
• 880-36-4 2-octylthiophene 
• 124-38-9 carbon dioxide 

Downstream Products

• 1258753-81-9 C₅₂H₅₄O₈S₂ 

Relevant articles and documents

Effect of alkyl chain and linking units on mesophase transitions and molecular order of rod-like thiophene mesogens: 13C NMR investigation

Thermotropic liquid crystals with π-conjugated cores are increasingly witnessed due to their promising optoelectronic and optophotonic properties. As π-conjugated mesogens are often realized by direct linking of the rings of the core, the mesophase transitions are usually modulated by inserting the required alkyl/alkoxy chains either at a terminal or lateral location. In this work, five mesogens in which thiophene and two phenyl rings are common in the core unit with terminal alkyl/alkoxy chains are investigated to probe the influence of (a) a terminal alkyl chain on the mesophase characteristics, (b) the linking units on the mesophase range and (c) the disparity of thiophene orientational constraints. The mesophase properties reveal that whenever the alkyl chain is located at one end of the molecule, polymesomorphism is observed. The XRD studies reveal layer ordering typical of smectic mesophases with lower temperature and higher order phases, namely SmB and CrE phases. A detailed 13C NMR study of the mesogens in the liquid crystalline phase indicates that the order parameters are governed by the nature of the substitution of thiophene and its linkage with two phenyl rings. Importantly, the 13C NMR data of the terminal chains in the liquid crystalline phase are compared with the recently reported thiophene mesogen in which the n-hexyl chain is located at the lateral position and completely different orientation characteristics were found for the terminal versus lateral chains.

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.