77014-10-9Relevant academic research and scientific papers
Fluorescent micellar nanoparticles by self-assembly of amphiphilic, nonionic and water self-dispersible polythiophenes with "hairy rod" architecture
Cianga, Luminita,Bendrea, Anca-Dana,Fifere, Nicusor,Nita, Loredana Elena,Doroftei, Florica,Ag, Didem,Seleci, Muharrem,Timur, Suna,Cianga, Ioan
, p. 56385 - 56405 (2015/02/18)
Polymers with "hairy-rod" architecture having oligo/polythiophene (PTh) as main chain and poly (ethylene glycol) (PEG) (Mn = 2000) as flexible side chains were obtained by combining the "macromonomer technique" with specific methods for the syn
Synthesis and characterization of alanine functionalized oligo/polythiophenes
McTiernan, Christopher D.,Chahma, M'Hamed
experimental part, p. 1417 - 1423 (2010/09/17)
The synthesis and characterization of a series of monothiophenes and terthiophenes bearing amino acids are reported. The reaction of a thiophene, substituted in position 3 by either a carboxylic acid or an acetic acid moiety, with an alanine methyl ester in the presence of hydroxybenzotriazole (HOBt) and N,N′-dicyclohexylcarbodiimide (DCC) affords several mono/terthiophene- alanine methyl esters. The latter were deprotected to form the corresponding carboxylic acids. Terthiophenes have been prepared in good yields via a Stille cross coupling reaction, using a dibromothiophene-alanine methyl ester and tri-butyl stannyl thiophene. The newly prepared monomers are very stable in air and in the presence of organic solvents. The optical and electrochemical properties of the monomers and their corresponding polymers were also examined using cyclic voltammetry and indium tin oxide (ITO) electrodes.
Synthesis and properties of light-emitting polythiophene derivatives bearing terphenyl mesogenic pendant
Chen, Lie,Chen, Yiwang,Zhou, Weihua,Li, Fan,He, Xiaohui,Tang, Ben Zhong
experimental part, p. 70 - 83 (2011/05/03)
A series of polythiophenes containing terphenyl mesogenic side chain at the third position through ester bonding was synthesized by dehalogenative polycondensation. The thiophene monomers 2,5-bromo-3-{[(4-(4'-cyano) terphenyloxy)carbonyl]-methyl]}-thiophene [M(CN)] and 2,5-bromo-3-{[(4-(4'- methoxy)terphenyloxy)-carbonyl]methyl}-thiophene [M(OCH3)] were prepared via Suzuki reation and esterification reactions, in sequence. The structures and properties of the monomers and polymers were characterized and evaluated with nuclear magnetic resonance, infrared spectroscopy, thermogravimetry, differential scanning calorimetry, polarized optical microscopy, ultraviolet spectroscopy, and photoluminescence. All of the polymers were stable, losing little of their weights when heated to 300°C. The polymers showed good solubility and could be dissolved in common solvents such as CHCl3, THF, DMF, etc. The monomers exhibited enantiotropic SmAd phases with a bilayer arrangement in the heating and cooling processes. Due to short spacer methylene ester between the bulk terphenyl mesogenic side chain and rigid polythiophene main chain, the polymers could not exhibit liquid crystallinty at elevated temperature. The existence of the chromophoric terphenyl core endows the polymers with high photoluminescence. When their CH2Cl2 solutions were photoexcited, the polymers emitted a strong UV light about 400nm.
Synthesis of Polythiophene Derivatives Bearing Ferroelectric Liquid Crystalline Substituents
Goto, Hiromasa,Dai, Xiaoman,Narihiro, Harunori,Akagi, Kazuo
, p. 2353 - 2362 (2007/10/03)
A chiral liquid crystalline (LC) substituent with a fluorine-containing asymmetric moiety was introduced into the 3-position of a thiophene ring. Polymerizations of 2,5-dibrominated thiophene derivatives were carried out through dehalogenative polycondensations. Polythiophene derivatives thus prepared were fusible and soluble in ordinary organic solvents. An absorption band was observed in the range of 400-415 nm. Phase transition behaviors of the polymers and monomers were examined by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction analysis. The polymers showed several types of smectic phases in the heating and cooling processes. Additionally, one of the polymers exhibited a striated fan-shaped texture when observed with a polarizing optical microscope. This is attributed to the formation of chiral smectic C (SmC*) phase, which is necessary property to ferroelectricity. Ferroelectric behavior was confirmed by examining the temperature dependence of the dielectric constant of the polymer.
Synthesis and properties of liquid crystalline polythiophene and polythienylenevinylene derivatives
Osaka, Itaru,Goto, Hiromasa,Itoh, Kikuo,Akagi, Kazuo
, p. 339 - 346 (2007/10/03)
Liquid crystalline polythiophene (LC-PTs) and polythienylenevinylene (LC-PTVs) derivatives with various length of methylene spacer in the LC substituents were synthesized. LC-PTs were prepared through dehalogenative polycondensation using Ni(0) complex, a
STUDIES ON HETEROCYCLIC COMPOUNDS VI. Synthesis of Thiophene Isoesters of Protoberberine Alkaloids
Jeganathan, S.,Srinivasan, M.
, p. 125 - 138 (2007/10/02)
Synthesis of thiophene isosters of protoberberine alkaloids (6, 12, 19) is described.The Mannich type reaction of the tetrahydroisoquinolines (5, 11) and the thienopyridine (18) with formaldehyde in glacial acetic acid afforded the title compounds.Cyclization of the tetrahydroisoquinoline derivative (23) failed to furnish the D-ring protoberberine isoster (25), but gave an unexpected product, the oxazepinoisoquinoline derivative (24).The conversion of the compound (24) to the 2-substituted isoquinoline (27) is also described.
Studies on Heterocyclic Compounds : Part V - Synthesis of 6-Acetyl-1,2-dimethoxy-4H-5,6,6a,7-tetrahydrobenzothienoquinoline
Jeganathan, S.,Srinivasan, M.
, p. 1028 - 1030 (2007/10/02)
Photosynthesis of 6-acetyl-1,2-dimethoxy-4H-5,6,6a,7-tetrahydrobenzothienoquinoline (9), which is a D-ring thiophene isoster of aporphine alkaloid, is described.The synthetic sequence involves Bischler-Napieralski reaction to the isoquinoline s
