- Synthesis, mesomorphism, photophysics and device performance of liquid-crystalline pincer complexes of gold(iii)
-
Emissive gold(iii) complexes of pincer 2,6-diphenylpyridines also bearing a phenylacetylide ligand have been modified at both the pincer and phenylacetylide to confer liquid crystalline properties, with most complexes showing a columnar hexagonal phase in
- Parker, Rachel R.,Liu, Denghui,Yu, Xiankang,Whitwood, Adrian C.,Zhu, Weiguo,Williams,Wang, Yafei,Lynam, Jason M.,Bruce, Duncan W.
-
p. 1287 - 1302
(2021/02/12)
-
- Design and synthesis of extended pyrene based discotic liquid crystalline dyes
-
The past few years have witnessed tremendous progress towards the design of new liquid crystalline (LC) materials comprised of rigid π-conjugated molecules, particularly disc shape molecules with appropriate substitution as an active component for the ele
- Irla, Sivakumar,Kumar, Sandeep,Pruthvi, Mahesh,Raghunathan, V. A.
-
-
- 2,1,3-Benzothiadiazole-based fluorophores. Synthesis, electrochemical, thermal and photophysical characterization
-
Three photoactive compounds with π-extended conjugation based on the 2,1,3-benzothiadiazole unit were synthesized and characterized. The compounds exhibited absorption in the violet-blue region with molar absorptivity coefficients and radiative rate constants arising from spin and symmetry allowed 1ππ* electronic transitions. An emission located in the green region with a large Stokes shift was observed, which was most likely due to a charge-transfer mechanism in the excited state. In spin-coated films a dependence on the fluorescence emission intensity with the size of the alkoxy chain could be observed, where an effective non-radiactive channel seems to be present to deactivate the excited state. The thermal properties were analyzed by differential scanning calorimetry (DSC), and all final compounds exhibited a similar behavior with a crystal-isotropic liquid transition during the heating scan and isotropic liquid-crystal transition during the cooling process. Thermogravimetric analysis indicated a main thermal event with an initial decomposition temperature that was higher than 340?°C. The electrochemical characterization indicate that the compounds exhibited a reversible peak at ?1.48?V and an irreversible oxidation process at 0.94?V versus Ag/Ag+. The electrochemical band gap was calculated to be approximately 2.30?eV versus NHE. The spectroelectrochemical measurements demonstrated changes in the absorption spectra due to changes in the electronic structure of the conjugated molecules under oxidative and reductive potentials.
- Frizon, Tiago Elias Allievi,Valdivia Martínez, Julio César,Westrup, José Luiz,Duarte, Rodrigo da Costa,Zapp, Eduardo,Domiciano, Kelvin Guessi,Rodembusch, Fabiano Severo,Dal-Bó, Alexandre Gon?alves
-
-
- Star-shaped ethynylpyrimidine with long alkoxyl side chains: synthesis, fluorescence and 2D self-assembling
-
In this contribution, we describe the synthesis of a star shaped ethynylpyrimidine having long alkoxyl side chains using Suzuki cross-coupling reactions. This compound presents interesting blue light emission fluorescence as well as self-assembling proper
- Achelle, Sylvain,Plé, Nelly,Kreher, David,Attias, André-Jean,Arfaoui, Imad,Charra, Fabrice
-
experimental part
p. 7055 - 7058
(2010/02/28)
-
- Synthesis of unsymmetrical dibenzoquinoxaline discotic mesogens
-
Unsymmetrical dibenzophenazine discotic mesogens were prepared via the corresponding tetraalkoxybenzfl derivatives. These dibenzophenazines exhibit Colho phases over extremely broad temperature ranges.
- Foster, E. Johan,Babuin, Jarret,Nguyen, Natalie,Williams, Vance E.
-
p. 2052 - 2053
(2007/10/03)
-
- Synthesis and characterization of a new class of liquid-crystalline, highly luminescent molecules containing a 2,4,6-triphenyl-1,3,5-triazine unit
-
A new class of 2,4,6-triphenyl-1,3,5-triazine derivatives having long alkoxyl side chains have been synthesized by a Pd(0)/Cu(I)-catalyzed carbon-carbon coupling reaction. These compounds behave as liquid-crystalline materials and show quantum yields high
- Lee, Chi-Han,Yamamoto, Takakazu
-
p. 3993 - 3996
(2007/10/03)
-