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Oligo thiophene s

Due to the high degree of conjugation, oh go(thiophene)s advanced as attractive candidates for molecular bridges. For instance, Sato et al. [34] constructed hexyl-sexithiophene and methoxy-terthiophene derivatives bearing two terminal ferrocenyl groups. These served as model compounds for molecular wires. In the hexyl-sexithiophene derivative, the resultant oxidized states spread over both the ferrocene and the sexithiophene moieties. Similarly, in the methoxy-terthiophene derivative, the oxidized species spreads over the entire molecule containing the terthiophene and the other ferrocene moiety. In both cases, CT between the terminal units is inferred as it is mediated via the oh go(thiophene)s. [Pg.58]

Plotting log(/trs) verus rDA yielded a linear dependence with an attenuation factor [Pg.59]


K. Sakamoto, Y. Takashima, H. Yamaguchi, A. Harada, Preparation and properties of rotaxanes formed by dimethyl-/3-cyclodextrin and oligo(thiophene)s with /3-cyclodextrin stoppers, J. Org. Chem., 2007, 72, 459 65. [Pg.324]

Different spectroscopic characteristics of solid films and solutions of alkyl substituted oligo(thiophene)s are observed. The origin is related to the presence of molecular associates as charged species [174]. [Pg.53]

Photoluminescence and electroluminescence are observed in PTs. The fluorescence lifetime and the fluorescence quantum yield of oligo(thiophene)s increase with increasing ring number (see Sect. 4.1.1) [360]. In quasi-one-dimensional... [Pg.71]

A simple model describes the linear and nonlinear optical properties of conjugated polymers [e.g., oligo(thiophene)s] found from the measurements of the optical band gap of two oligomers of different length, without the need for supercomputing power [409]. Photocatalytic CO2 fixation is observed in photoirradiation experiments on a PAT film immersed in ethanol solution containing 4-butylphenol in a CO2 atmosphere [367,368]. An electric field induces changes in the optical properties of PATs and poly(thienylene vinylenejs. The induced absorption is proportional to the square of the applied electric field and its line shape is field invariant [410]. [Pg.76]

The conjugation length of oligo(thiophene) increases with the length of the jt-electron system [84]. The absorption maxima of oligo(thiophene)s in CHCI3... [Pg.80]

The relative stabilities of the oxidized oligo(thiophene)s and PTs depend on the oxidation state (i.e. the doping level) [177, 541]. The dependence is weakest for FeCla-doped PAT above 10 Scm Below that value the dedoping rate decreases with decreasing electrical conductivity, as is the case for organic acid anions. For the dopant I2 and the dopant anion PFg the decay rate is proportional to the electrical conductivity [189]. The deterioration of the electrical conductivity with time depending on the doping level is also found for PAT with n = 12 [542]. PBT in the neutral (dedoped) form is stable up to 300 °C and... [Pg.90]

For the preparation of PAT (n = 1,6, 8,12) and of poIy(3-cyanothiophene) with high yields, a zero-valent nickel complex is also used [266]. Hexyl substituted oligo(thiophene)s (number of thiophene rings 6,9,12,15) can be prepared by the Ni(0)-catalyzed coupling reaction of a 5,5"-dibromo-3,3"-dihexyl-2,2 5, 2"-terthiophene) [572, 573]. PT derivatives having alkyloxy substituents at 3 positions are synthesized by dehalogenation polycondensation of the corresponding 2,5-dibromothiophene derivatives with zero-valent nickel complexes [247],... [Pg.94]

A composite comprising paper and a conducting polymer can be prepared by impregnation of paper with a solution of a precursor polymer and heat treating the coated paper. The electrically conducting polymer is located on the surface or between the fibers of the paper [885]. Sexithiophene and other oligo(thiophene)s are ideal photochromic materials for efficient and ultrafast incoherent-to-coherent optical converters [886]. [Pg.182]


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