Browsing by Author "Sobarzo Aucal, Patricio Antonio"

Now showing 1 - 12 of 12
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    Diphenylsilane-containing linear and rigid whole aromatic poly(azomethine)s. Structural and physical characterization
    (2018) Tundidor Camba, Alain; González Enríquez, Carmen; Sarabia Vallejos, Mauricio; Tagle Domínguez, Luis Hernán; Sobarzo Aucal, Patricio Antonio; Gonzalez, A.; Hauyón Sepúlveda, René Alejandro; Mariman, A. P.; Terraza Inostroza, Claudio; Tundidor Camba, Alain; González Enríquez, Carmen; Sarabia Vallejos, Mauricio; Tagle Domínguez, Luis Hernán; Sobarzo Aucal, Patricio Antonio; Gonzalez, A.; Hauyón Sepúlveda, René Alejandro; Mariman, A. P.; Terraza Inostroza, Claudio
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    Effect of triphenylamine as electron-donor evenly spaced in 2, 4, 6 and 8 thiophene units of the main chain : synthesis and properties
    (2015) Salas Sánchez, Cristián Osvaldo; Schott Verdugo, Eduardo Enrique; Zarate, Ximena; Macleod-Carey, D.; Sobarzo Aucal, Patricio Antonio; Gatica, N.; Salas Sánchez, Cristián Osvaldo; Schott Verdugo, Eduardo Enrique; Zarate, Ximena; Macleod-Carey, D.; Sobarzo Aucal, Patricio Antonio; Gatica, N.
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    Flexible oligomeric silicon-containing poly(ether-azomethine)s obtained from epoxide derivatives. Synthesis and characterization
    (2019) Tundidor Camba, Alain; Araya, Nélida; González Enríquez, Carmen; Tagle Domínguez, Luis Hernán; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; Rodríguez González, Fidel E.; Jessop Rivera, Ignacio; Recabarren Gajardo, Gonzalo; Terraza Inostroza, Claudio; Tundidor Camba, Alain; Araya, Nélida; González Enríquez, Carmen; Tagle Domínguez, Luis Hernán; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; Rodríguez González, Fidel E.; Jessop Rivera, Ignacio; Recabarren Gajardo, Gonzalo; Terraza Inostroza, Claudio
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    New cardo silylated poly(azomethine)s containing 9,9 '-diphenylfluorene units as materials with bronsted acid-dependent fluorescence
    (2020) Hauyón Sepúlveda, René Alejandro; Garrido Gatica, Gabriela Lurdes; Sobarzo Aucal, Patricio Antonio; González Enríquez, Carmen; Tagle Domínguez, Luis Hernán; Rodríguez González, Fidel E.; Jessop Rivera, Ignacio; Recabarren Gajardo, Gonzalo; Tundidor Camba, Alain; Terraza Inostroza, Claudio
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    New Light-Green Thermally Activated Delayed Fluorescence Polymer Based on Dimethylacridine-Triphenyltriazine Light-Emitting Unit and Tetraphenylsilane Moiety as Non-Conjugated Backbone
    (MDPI, 2023) Hauyon Sepúlveda, Rene Alejandro; Sobarzo Aucal, Patricio Antonio; Medina Martínez, Jean André; Garcia, Luis; Tundidor Camba, Alain; Terraza Inostroza, Claudio Alberto; Fuentealba Patino, Denis Alberto; Pizarro, Nancy; Ortega Alfaro, María C.; Ugalde Saldívar, Víctor M.; Jessop Rivera, Ignacio Andrés; González Henríquez, Carmen
    In the search for solution-processable TADF materials as a light emitting layer for OLED devices, polymers have attracted considerable attention due to their better thermal and morphological properties in the film state with respect to small molecules. In this work, a new polymer (p-TPS-DMAC-TRZ) with thermally activated delayed fluorescence (TADF) light-emitting characteristics was prepared from a conjugation-break unit (TPS) and a well-known TADF core (DAMC-TRZ). This material was designed to preserve the photophysical properties of DAMC-TRZ, while improving other properties, such as thermal stability, promoted by its polymerization with a TPS core. Along with excellent solubility in common organic solvents such as toluene, chloroform and THF, the polymer (Mn = 9500; Mw = 15200) showed high thermal stability (TDT5% = 481 °C), and a Tg value of 265 °C, parameters higher than the reference small molecule DMAC-TRZ (TDT5% = 305 °C; Tg = 91 °C). The photoluminescence maximum of the polymer was centered at 508 nm in the solid state, showing a low redshift compared to DMAC-TRZ (500 nm), while also showing a redshift in solution with solvents of increasing polarity. Time-resolved photoluminescence of p-TPS-DMAC-TRZ at 298 K, showed considerable delayed emission in solid state, with two relatively long lifetimes, 0.290 s (0.14) and 2.06 s (0.50), and a short lifetime of 23.6 ns, while at 77 K, the delayed emission was considerably quenched, and two lifetimes in total were observed, 24.6 ns (0.80) and 180 ns (0.20), which was expected from the slower RISC process at lower temperatures, decreasing the efficiency of the delayed emission and demonstrating that p-TPS-DMAC-TRZ has a TADF emission. This is in agreement with room temperature TRPL measurements in solution, where a decrease in both lifetime and delayed contribution to total photoluminescence was observed when oxygen was present. The PLQY of the mCP blend films with 1% p-TPS-DMAC-DMAC-TRZ as a dopant was determined to be equal to 0.62, while in the pure film, it was equal to 0.29, which is lower than that observed for DMAC-TRZ (0.81). Cyclic voltammetry experiments showed similarities between p-TPS-DMAC-TRZ and DAMC-TRZ with HOMO and LUMO energies of ?5.14 eV and ?2.76 eV, respectively, establishing an electrochemical bandgap value of 2.38 eV. The thin film morphology of p-TPS-DMAC-TRZ and DMAC-TRZ was compared by AFM and FE-SEM, and the results showed that p-TPS-DMAC-TRZ has a smoother surface with fewer defects, such as aggregations. These results show that the design strategy succeeded in improving the thermal and morphological properties in the polymeric material compared to the reference small molecule, while the photophysical properties were mostly maintained, except for the PLQY determined in the pure films. Still, these results show that p-TPS-DMAC-TRZ is a good candidate for use as a light-emitting layer in OLED devices, especially when used as a host-guest mixture in suitable materials such as mCP.
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    New oligomeric poly(ether-imide)s containing diphenylsilane and dibenzofuran moieties. Synthesis and characterization
    (2018) Tundidor Camba, Alain; Tagle Domínguez, Luis Hernán; González Enríquez, Carmen; Coll Herrera, Deysma; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; Jessop Rivera, Ignacio; Terraza Inostroza, Claudio
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    New thiophene-based poly(azomethine)s bearing tetraphenylsilane moieties along their backbone. Optical, electronic, thermal properties and theoretical calculations
    (2020) Sobarzo Aucal, Patricio Antonio; Jessop Rivera, Ignacio; Mariman, A. P.; Gonzalez, A. F.; Saldias, C.; Schott Verdugo, Eduardo Enrique; Zarate, X.; Hauyón Sepúlveda, René Alejandro; Recabarren Gajardo, Gonzalo; Terraza Inostroza, Claudio; González Enríquez, Carmen; Tundidor Camba, Alain
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    New triphenylamine-based oligomeric schiff bases containing tetraphenylsilane moieties in the backbone
    (2019) Sobarzo Aucal, Patricio Antonio; Gonzalez, A.F.; Schott Verdugo, Eduardo Enrique; Tagle Domínguez, Luis Hernán; Tundidor Camba, Alain; González Enríquez, Carmen; Jessop Rivera, Ignacio; Terraza Inostroza, Claudio
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    Novel schiff base self-condensed oligomers in complexation with metallic triflates of low-band gap properties
    (2015) Sánchez, Christian O.; Sobarzo Aucal, Patricio Antonio; Schott Verdugo, Eduardo Enrique; Zárate, Ximena; Bustos, Carlos; Sánchez, Christian O.; Sobarzo Aucal, Patricio Antonio; Schott Verdugo, Eduardo Enrique; Zárate, Ximena; Bustos, Carlos
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    Silylated oligomeric poly(ether-azomethine)s from monomers containing biphenyl moieties: synthesis and characterization
    (2018) Tundidor Camba, Alain; Sarabia Vallejos, Mauricio; Tagle Domínguez, Luis Hernán; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; González Enríquez, Carmen; Ortiz Álvarez, Pablo Andrés; Terraza Inostroza, Claudio; González Enríquez, Carmen; Maya, Eva M.; Tundidor Camba, Alain; Sarabia Vallejos, Mauricio; Tagle Domínguez, Luis Hernán; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; González Parra, Alexis Antonio.; Ortiz Álvarez, Pablo Andrés; Terraza Inostroza, Claudio; González Enríquez, Carmen; Maya, Eva M.
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    Síntesis y caracterización de oligo- y poli(azometino)s aromáticos a partir de monómeros con grupos tetrafenilsilil-disustituidos : estudio de propiedades y aplicaciones
    (2021) Sobarzo Aucal, Patricio Antonio; Terraza Inostroza, Claudio; Pontificia Universidad Católica de Chile. Facultad de Química
    Se prepararon nuevas series de oligo(azometino)s (o-AZs) y poli(azometino)s (PAZs) sililados (series o-AZSi, o-AZP, o-AZtF, poliAZTh y poliAZPy, respectivamente) conteniendo núcleos tetrafenilsilano y unidades trifenilamina, tiofeno y piridina en la cadena principal, a partir de monómeros diaminas y dialdehídos por medio de reacciones de policondensación en disolución a alta temperatura. Las series de o-AZs y PAZs fueron caracterizados estructuralmente mediante técnicas espectroscópicas (IR-TF y RMN) y para la serie complejada (poliAZPyM) análisis elemental. La solubilidad de los materiales de las series derivadas de los monómeros sililados (o-AZSi, o-AZP y poliAZPy), serie comparativa (o-AZV) y polímeros conteniendo hierro(III) (poliAZPyM) fue reducida bajo las condiciones estudiadas, similar a lo mostrado por materiales con alto contenido aromático. Las series o-AZtF y poliAZTh resultaron solubles en solventes organicos comunes, y en el caso de PAZs derivados de tiofeno se registró alto peso molecular (22,2 kDa). Asimismo, los o-AZs y PAZs mostraron estabilidad sobre 350 ºC, similar a familias de o-AZs y PAZs reportados previamente Los o-AZs y PAZs mostraron una amplio intervalo de absorcion y emisión en el intervalo UV-vis, además, evidenciaron fotoluminiscencia, moderados corrimientos de Stokes y energías HOMO-LUMO adecuadas para aplicaciones en opto-eletrónica. Los band gaps ópticos de las diferentes series están en el intervalo de 2,36 a 3,61 eV, donde la serie de PAZs derivados de tiofeno (poliAZTh) presentaron características de semiconductores (poliAZThe; 1,98 eV). La serie poliAZPyM conteniendo unidades TPS y bis(imino)piridina como ligando de anclaje tipo “pinza”, fue empleada para anclar hierro y obtener nuevos catalizadores heterogéneos para la cicloadición de CO2 a epóxidos a fin de preparar carbonatos cíclicos. Estos catalizadores fueron eficientes bajo condiciones moderadas (3 bar de CO2), mostrando alta conversión (hasta 95%) y selectividad hacia el carbonato cíclico en relación con sistemas similares, basados en PAZs, previamente reportados. Estos resultados sugieren que las nuevas series de PAZs presentan alta versatilidad, y de acuerdo con su estructura específica, pueden ser potenciales candidatos para aplicaciones en optoelectrónica y catálisis heterogénea.