Physicochemical and redox properties of SnCl2·2H2O/ChCl deep eutectic solvent were studied and applied in the synthesis of anilines, N-arylacetamides and indolo(pyrrolo)[1,2-a]quinoxalines starting from nitroaromatic compounds.
In this contribution, a sustainable one-pot diastereoselective synthesis of tetrahydroquinolines through the aza Diels−Alder reaction is reported starting from star anise oil, substituted anilines, and aromatic aldehydes in a choline chloride/zinc chloride eutectic mixture as new reaction media. Star anise extracts and essential oils obtained by Soxhlet, ultrasound-assisted extraction, steam distillation, and hydrodistillation were analyzed by gas chromatography− mass spectrometry finding the highest content of trans-anethol from hydrodistillation; in addition, the eutectic composition and temperature for the choline chloride/zinc chloride mixture were revisited. All the compounds were obtained in 28−98% yield with diastereoselectivity toward the cis-(2e,4e) product. Furthermore, the deep eutectic solvent was reused in three cycles without observing a detrimental catalytic activity, and green metric analysis showed a favorable environmental impact of this synthetic method.
Síntesis de películas delgadas depresentan una estructura amorfa; sin embargo, muestras con espesores mayores de 300 nm crecen con estructura cristalina correspondiente a la fase ZnSO 8 H 8 (sulfohidróxido de zinc), indicando que la película formada es realmente una mezcla de ZnS e hidróxidos de Zn, conocidos genéricamente en la literatura como Zn(S,OH).Abstract ZnS thin films were deposited by CBD (chemical bath deposition) method using a solution containing thiourea and zinc acetate as sources of S and Zn and ammonium citrate as complexing agent. The samples were grown on soda lime glass substrates covered with a Cu 2 SnZnS 4 (CZTS) thin film. Through an extensive parameter study carried out varying the main deposition parameter in a wide range, conditions were found to grow ZnS thin films with suitable properties to be used as buffer layer in Cu 2 SnZnS 4 based solar cells.
A pesar del rápido crecimiento que ha tenido el uso de las celdas solares para la generación de electricidad, los altos costos de fabricación de los dispositivos tradicionales ha impedido su masificación. Se hace necesario desarrollar celdas solares de menor costo. Una de las nuevas tecnologías que genera mayores expectativas es la de las celdas solares orgánicas, basadas en polímeros semiconductores, lascuales, hasta el momento, presentan eficiencias de conversión inferiores al 10%. Presentamos aquí algunos resultados de un trabajo de investigación que busca la síntesis de nuevos polímeros semiconductores, específicamente de poli–3,4–diisobutoxitiofeno y poli–3,4–dimetoxitiofeno, con propiedades ópticas, electrónicas y estructurales adecuadas para la fabricación de celdas solares con mayores eficiencias de conversión.
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