358374-59-1Relevant articles and documents
Photophysical properties of isoelectronic oligomers with vinylene, imine, azine and ethynylene spacers bearing triphenylamine and carbazole end-groups
Grigoras, Mircea,Vacareanu, Loredana,Ivan, Teofilia,Catargiu, Ana Maria
, p. 71 - 81 (2013/06/27)
Ten symmetrical oligomers containing either triphenylamine or carbazole substituents as end-groups and 1,4-phenylenevinylene, 1,4-phenylene imine, azine and 1,4-phenylene ethynylene as π-spacers, have been synthesized by polycondensation reactions between aromatic aldehydes (4- formyltriphenylamine and 3-formyl N-hexylcarbazole) or iodides (4-iodotriphenylamine and 3-iodo Nhexylcarbazole) with bisphosphonate derivative, 1,4-diaminobenzene, hydrazine or 1,4- diethynylbenzene, respectively. These oligomers are models for the corresponding conducting polymers, have a well-defined molecular structure, can be highly purified using common methods and processed as thin films by vacuum evaporation, dip or spin coating. The oligomers preserve all of the properties and potential applications of the corresponding polymers. The structural characterization of these oligomers was performed using usual spectroscopic methods (1H-RMN, FT-IR and DSC) and their photophysical properties were analyzed by UVeVis and fluorescence spectroscopy. Their redox properties were studied by cyclic voltammetry.
TPA-active D-π-D fluorophores with rigid, planar cores from phenylene to indenofluorene and indolocarbazole
Liu, Zhiqiang,Cao, Duxia,Chen, Ying,Fang, Qi
experimental part, p. 63 - 67 (2010/11/04)
A series of D-π-D quadrupolar fluorophores with systematically varied π-conjugated cores were prepared using the Heck reaction and their single- and two-photon photophysical properties were examined. Introduction of extended π-conjugated cores such as indenofluorene/indolocarbazole was found to induce only small shifts in the absorption and emission maxima versus the phenylene linked fluorophore but greatly enhance their single- and two-photon absorption cross-sections. The effects of positional substitution on the properties of the indolocarbazole derivatives were also investigated.
Two-photon photosensitized production of singlet oxygen: Sensitizers with phenylene-ethynylene-based chromophores
McIlroy, Sean P.,Clo, Emiliano,Nikolajsen, Lars,Frederiksen, Peter K.,Nielsen, Christian B.,Mikkelsen, Kurt V.,Gothelf, Kurt V.,Ogilby, Peter R.
, p. 1134 - 1146 (2007/10/03)
(Chemical Equation Presented) Singlet molecular oxygen (a 1Δg) has been produced and optically monitored in time-resolved experiments upon nonlinear two-photon excitation of photosensitizers that contain triple bonds as an integral part of the chromophore. Both experiments and ab initio computations indicate that the photophysical properties of alkyne-containing sensitizers are similar to those in the alkene-containing analogues. Most importantly, however, in comparison to the analogue that contains double bonds, the sensitizer containing alkyne moieties is more stable against singlet-oxygen-mediated photooxygenation reactions. This increased stability can be advantageous, particularly with respect to two-photon singlet oxygen imaging experiments in which data are collected over comparatively long time periods.
