25934-47-8Relevant articles and documents
Design and synthesis of extended pyrene based discotic liquid crystalline dyes
Irla, Sivakumar,Kumar, Sandeep,Pruthvi, Mahesh,Raghunathan, V. A.
, (2021)
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
2,1,3-Benzothiadiazole-based fluorophores. Synthesis, electrochemical, thermal and photophysical characterization
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
, p. 26 - 35 (2016/09/07)
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.
Thermotropic properties and molecular packing of discotic tristriazolotriazines with rigid substituents
Rieth, Thorsten,Marszalek, Tomasz,Pisula, Wojciech,Detert, Heiner
supporting information, p. 5000 - 5006 (2014/05/06)
Tristriazolotriazines with a threefold dialkoxyaryl substitution have been prepared by Huisgen reaction of cyanuric chloride and the corresponding tetrazoles. Although these dyes show a negative or inverted solvatochromism of the UV/Vis absorption, their
