1268604-56-3Relevant academic research and scientific papers
Molecular design and photovoltaic performance of organic dyes containing phenothiazine for dye-sensitized solar cells
Jo, Hyo Jeong,Nam, Jung Eun,Sim, Kyoseung,Kim, Dae-Hwan,Kim, Jae Hong,Kang, Jin-Kyu
, p. 7938 - 7942 (2014)
We synthesized novel organic photosensitizers based on fluorine-substituted phenothiazine with thiophene bridge units in the chromophore for application in dye-sensitized solar cells (DSSCs). Furthermore, organic dyes with different acceptors exhibited higher molar extinction coefficients, and better light absorption at longer wavelengths. The photovoltaic properties of organic dyes composed of different acceptors in their chromophores were measured to identify their effects on the DSSC performance. The organic dye, PFSCN2 containing multi-cyanoacrylic acid as the electron acceptor, showed a power conversion efficiency of 4.67% under AM 1.5 illumination (100 mW/cm2). The retarded recombination kinetics from TiO2 electrode to electrolyte enhanced the electron life time of the organic dye, PFSCN2 in the photoanode of the DSSC. This was confirmed with impedance analysis.
Insights on bimetallic micellar nanocatalysis for buchwald-hartwig aminations
Ansari, Tharique N.,Taussat, Armand,Clark, Adam H.,Nachtegaal, Maarten,Plummer, Scott,Gallou, Fabrice,Handa, Sachin
, p. 10389 - 10397 (2019/10/14)
A nanocatalyst for micellar Buchwald-Hartwig aminations is developed, thoroughly characterized, and applied on a variety of substrates. The catalyst is stable under ambient conditions for at least six months. The catalyst retained its activity after several cycles, and its structure remained intact as confirmed by NMR spectroscopy. Association of Pd nanoparticles with Cu by a phosphine ligand is revealed by 31P NMR spectroscopy, and their linkage with the activated carbon surface is revealed by XAS analysis. Control NMR experiments revealed the binding of the ligand with both Cu and Pd, and all phosphine molecules are under the same environment. In addition to NMR and XAS analysis, the catalyst is characterized by SEM, HRTEM, XPS, and TGA. Reactions are highly reproducible at variable scales. Environmentally benign, proline-based amphiphile PS-750-M is critical for catalytic activity, which is achieved under mild conditions in water as the reaction medium. The inherent sustainability of these conditions coupled with a low E factor achievable through robust recycling of catalyst and reaction medium demonstrates the significant utility of this technology.
Synthesis and characterization of fluorene-based oligomers and polymers incorporating N-arylphenothiazine-S,S-dioxide units
Kamtekar, Kiran T.,Dahms, Katja,Batsanov, Andrei S.,Jankus, Vygintas,Vaughan, Helen L.,Monkman, Andrew P.,Bryce, Martin R.
scheme or table, p. 1129 - 1137 (2012/02/05)
A series of 3,7-bis(9,9-di-n-hexylfluoren-2-yl)-N-arylphenothiazine-S,S- dioxide trimers and (9,9-di-n-octylfluorene-2,7-diyl-co-N-arylphenothiazine-S,S- dioxide) co-polymers, with varying ratios of phenothiazine-S,S-dioxide units, have been prepared in good yields by palladium-catalyzed cross-coupling reactions. The materials are deep blue emitters and show no solvatochromism or evidence for an intramolecular charge-transfer state. The photoluminescence quantum yields of the trimers are φPL 15-30% in solution and 14-25% in films. The polymers demonstrated very high values in solution (φPL 74-84%) and φPL values in films of 28-47%. The estimated HOMO energy levels are between -5.64 and -5.62 eV for the polymers with 15% incorporation of the phenothiazine-S,S-dioxide units. An analogous N-arylphenothiazine co-polymer shows significantly red shifted absorption and emission. Solution electrochemical data and density functional theory calculations are also presented.
