Hexacoordinated tin complexes catalyse imine hydrogenation with H2

Impact Factor (IF) 2023 (2024 update): 4.3Fil: Žáková, Andrea. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Saha, Pritha. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Paparakis, Alexandros. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Zábranský, Martin. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Gastelu, Gabriela. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Química Orgánica; Argentina.Fil: Gastelu, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Físico-Química Córdoba; Argentina.Fil: Kukla, Jaroslav. University Prague. Faculty of Science Charles. Institute of Environmental Studies; Czech Republic.Fil: Uranga, Jorge G. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Uranga, Jorge G. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Físico-Química Córdoba; Argentina.Fil: Hulla, Martin. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Frustrated Lewis pair (FLP) hydrogenation catalysts predominantly use alkyl- and aryl-substituted Lewis acids (LA) that offer a limited number of combinations of substituents, limiting our ability to tune their properties and, ultimately, their reactivity. Nevertheless, main-group complexes have numerous ligands available for such purposes, which could enable us to broaden the range of FLP catalysis. Supporting this hypothesis, we demonstrate here that hexacoordinated tin complexes with Schiff base ligands catalyse imine hydrogenation via activation of H2(g). As shown by hydrogen–deuterium scrambling, [Sn(tBu2Salen)(OTf)2] activated H2(g) at 25 °C and 10 bar of H2. After tuning the ligands, we found that [Sn(Salen)Cl2] was the most efficient imine hydrogenation catalyst despite having the lowest activity in H2(g) activation. Moreover, various imines were hydrogenated in yields up to 98% thereby opening up opportunities for developing novel FLP hydrogenation catalysts based on hexacoordinated LA of main-group elements.info:eu-repo/semantics/publishedVersionFil: Žáková, Andrea. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Saha, Pritha. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Paparakis, Alexandros. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Zábranský, Martin. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic.Fil: Gastelu, Gabriela. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Química Orgánica; Argentina.Fil: Gastelu, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Físico-Química Córdoba; Argentina.Fil: Kukla, Jaroslav. University Prague. Faculty of Science Charles. Institute of Environmental Studies; Czech Republic.Fil: Uranga, Jorge G. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Uranga, Jorge G. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Físico-Química Córdoba; Argentina.Fil: Hulla, Martin. University Prague. Faculty of Science. Charles Department of Inorganic Chemistry; Czech Republic

Secondary Raw Materials from Residual Carbon Fiber-Reinforced Composites by An Upgraded Pyrolysis Process

This paper presents a process where carbon fibers and hydrogen can be recovered simultaneously through a two-stage thermal treatment of an epoxy-carbon fiber composite. For this purpose, some pieces of epoxy resin reinforced with carbon fiber fabrics have been fabricated and, after curing, have been pyrolyzed in an installation consisting of two reactors. In the first one, the thermal decomposition of the resin takes place, and in the second one, the gases and vapors coming from the first reactor are thermally treated. Once this process is completed, the solid generated is oxidized with air to eliminate the resin residues and carbonaceous products from the fibers surface. The recovered carbon fiber fabrics have been reused to make new cured parts and their electrical and mechanical properties have been measured. The results show that it is possible to obtain carbon fiber fabrics that can be processed as they leave the recycling process and that retain 80% of the tensile modulus, 70% of the flexural strength, and 50% of the interlaminar shear strength. At the same time, a gaseous stream with more than 66% by volume of hydrogen can be obtained, reaching a maximum of 81.7%.This research was funded by the Ministry of Science and Innovation of the Spanish Government through the project with reference PID2019-110770RB-I00 and by the Basque Government through the project with reference KK-2020/00107 (ELKARTEK program). Besides, the Basque Government also contributed to this work by means of the regular funding granted to consolidated research teams (IT993-16) and the researcher training grant awarded to Naia Gastelu