Person: Urieta Mora, Javier
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First Name
Javier
Last Name
Urieta Mora
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Orgánica
Area
Identifiers
5 results
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Item Speeding up heterogeneous catalysis with an improved highly reusable catalyst for the preparation of enantioenriched secondary alcohols(Reactive and Functional Polymers, 2017) Sánchez Carnerero, Esther M. Márquez; Sandoval Torrientes, Rafael; Urieta Mora, Javier; Moreno Jiménez, Florencio; Maroto, Beatriz Lora; Moya Cerero, Santiago de laA new catalytic heterogeneous system, very efficient and highly reusable, for the preparation of enantioenriched secondary alcohols through the addition of diethylzinc to benzaldehyde has been developed. This system is based on a chiral bis(hydroxyamide) ligand supported on crosslinked polystyrene. The catalyst has been shown to be very efficient, leading to the corresponding secondary alcohol with an enantiomeric excess of 93% in a time as short as 2 h and using just 4% of the heterogeneous catalyst and just 1.5 equivalents of the organozinc reagent. We have demonstrated that the new catalyst is very stable and can be efficiently recycled with no decrease in yield or enantioselectivity. The presented system has an unquestionable interest for the potential transfer of the reaction to the industry by using catalytic fluidized-bed reactors.Item Preparation of dipyrrins from F-BODIPYs by treatment with methanesulfonic acids(RSC Advances, 2015) Urieta Mora, Javier; Lora Maroto, Beatriz; Moreno Jiménez, Florencio; Rodríguez Agarrabeitia, Antonia; Ortiz García, María Josefa; Moya Cerero, Santiago De LaAn alternative metal-free soft procedure for the preparation of dipyrrins from F-BODIPYs is reported. The new method makes possible to obtain certain dipyrrin derivatives that were unaccessible from F-BODIPYs to date. To demonstrate the ability of the new procedure, dipyrrins having highly reactive groups, such as chloro, cyano or acetoxyl, have been easily obtained from the corresponding F-BODIPY, which shows the synthetic utility of the reported methodology.Item High-Efficiency Perovskite Solar Cells using Molecularly-Engineered, Thiophene-Rich,Hole-Transporting Materials: Influence of Alkyl Chain Length on Power Conversion Efficiency(Advanced energy materials, 2016) Zimmermann, Iwan; Urieta Mora, Javier; Gratia, Paul; Aragó, Juan; Grancini, Giulia; Molina-Ontoria, Agustín; Ortí, Enrique; Martín, Nazario; Khaja Nazeeruddin, MohammadThe synthesis and characterization of a series of novel small-molecule hole-transporting materials (HTMs) based on an anthra[1,2-b:4,3-b′:5,6-b′′:8,7-b′′′]tetrathiophene (ATT) core are reported. The new compounds follow an easy synthetic route and have no need of expensive purification steps. The novel HTMs were tested in perovskite solar cells (PSCs) and power conversion efficiencies (PCE) of up to 18.1 % under 1 sun irradiation were 2 measured. This value is comparable with the 17.8 % efficiency obtained using spiroOMeTAD as a reference compound. Similarly, a significant quenching of the Photoluminescence in the first nanosecond is observed, indicative of effective hole transfer.Additionally, the influence of introducing aliphatic alkyl chains acting as solubilizers on the device performance of the ATT molecules is investigated. Replacing the methoxy groups on the triarylamine sites by butoxy-, hexoxy- or decoxy-substituents greatly improved the solubility of the compounds without changing the energy levels, yet at the same time significantly decreasing the conductivity as well as the PCE, 17.3 % for ATT-OBu, 15.7 % for ATT-OHex and 9.7 % for ATT-ODec.Item Design and synthesis of organic p-type semiconductors: toward efficient Perovskite Solar Cells(2021) Urieta Mora, Javier; Martín León, Nazario; Molina Ontoria, AgustínPerovskite solar cells (PSCs) have become one of the most promising technologies for searching clean alternatives to fossil fuels in order to achieve a sustainable society taking advantage of the unlimited solar energy. In a few years of research, PSCs have reached promising efficiencies up to 25% which are comparable to the commercial silicon-based cells. As a means to improve the efficiencies and the stability of PSCs, the research has been closely connected to the design of highly efficient charge selective layers such as electron (ETMs) and hole-transporting materials (HTMs). Although the charge selective layer could present either inorganic or polymeric structures, organic-based small molecules have been demonstrated as the most promising alternative for the preparation of highly efficient PSCs...Item Influence of alkyl chain length on the photovoltaic properties of dithienopyran-based hole-transporting materials for perovskite solar cells(Journal of Materials Chemistry C, 2023) Caicedo Reina, Mauricio; Pérez Escribano, Manuel; Urieta Mora, Javier; García Benito, Inés; Calbo, Joaquín; Ortiz, Alejandro; Insuasty, Braulio; Molina Ontoria, Agustín; Ortí, Enrique; Nazario Martín; Martín León, NazarioA tailored design of asymmetric hole-transporting materials (HTMs) is reported with the synthesis of a family of new HTMs based on the use of the 5H-dithieno[3,2-b:20 ,30 -d]pyran (DTP) moiety endowed with donor p-methoxytriphenylamines. A complete experimental and theoretical characterization of the optoelectronic, electrochemical and thermal properties is presented, showing more marked differences in the latter prompted by the different length of the alkyl chains (ethyl, butyl or hexyl) attached to the DTP core. This chemical design plays an important role in the morphological behavior of the new HTMs, displaying a different ability for the deposition on the top surface of the perovskite layer in perovskite solar cells (PSCs), as evidenced by scanning electron microscopy. The photovoltaic performance of the new DTP-based HTMs is highly affected by this morphological behavior, resulting in a maximum power conversion efficiency (PCE) of 17.39% for the ethyl derivative (DTPA-Et) in planar devices in combination with the state-of-the-art triple cation perovskite [(FAPbI3)0.87(MAPbBr3)0.13]0.92[CsPbI3]0.08. Otherwise, the hexyl derivative (DTPA-Hex) showed a decreased value of PCE of 15.04% due to its higher dispersity in chlorobenzene, resulting in a less uniform and lower quality film. In comparison, the reference cell using spiro-OMeTAD reaches a maximum PCE of 18.06%. This work demonstrates that DTP is a good candidate for the preparation of HTMs with high hole mobilities for exploitation in efficient and stable PSCs.