Jul 31
by ZFreixa in Congresses 0 comments

Zoraida at ISHC (Amsterdam) & ECIRM (Barcelona) 2018

Zoraida Freixa presented our work on the mechanism of imine hydrosilylation at ICOMC 2018 in Florence, and at the ECIRM in Barcelona.
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Jul 31
by ZFreixa in Congresses, People, Quimica 0 comments

Eder at ICOMC 2018, FLorence

Eder Tomás González de Mendivil presented his work at ICOMC 2018 in Florence.  
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Jul 31
by ZFreixa in People, Quimica 0 comments

Pablo Corral & Mikel Sanz defended their final projects.

On Tuesday 11th July Mikel Sanz and Pablo Corral defended their Final Degree Projects.    
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Feb 04
by ZFreixa in Meetings, Quimica, seminar 0 comments

Second CTQ2015-65268-C2 Workshop

On Friday 26th of January the second workshop on the progress of our Coordinated Project (CTQ2015-65268-C2) H2MET2015 was held in San Sebastián at UPV-EHU. All the researchers involved in the project presented their latest results. External researchers from the Department were also invited to contribute.
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Dic 06
by ZFreixa in Quimica 0 comments

Experimental Evidence Supporting Related Mechanisms for Ru(II)-Catalyzed Dehydrocoupling and Hydrolysis of Amine-Boranes

Our last work on the mechanism of the hydrolytic decomposition of amine-boranes just published in ACS Catalysis.   A family of ruthenium(II) half-sandwich complexes was tested for the hydrolytic decomposition of amine-boranes. The analysis of the catalytic results, together with a multilateral approach based on 1H, 11B NMR, and ESI-MS were used to propose a plausible and conceptually unified mechanism for both the hydrolysis and competitive dehydrogenation of amine-boranes. We propose the intermediacy of solvent-stabilized borenium cations during the catalytic cycle, evolving toward dehydrogenation products in distilled THF or releasing amine-hydroxyboranes in aqueous media. Both reaction pathways would liberate up to 1 equivalent of hydrogen through a metal-catalyzed process, but an out-of-cycle low-barrier hydrolysis of amine-hydroxyboranes would produce the 2 additional equivalents of hydrogen in aqueous solutions. Metal-catalyzed deuteration of (non hydrogen-productive) trisubstituted amine-boranes by using D2O as deuterium source was observed, and included as part of the mechanism proposal.  
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Nov 11
by ZFreixa in Cities, Meetings, Quimica, seminar, Zoraida 0 comments

Summer School on Catalysis, Quingao 2017

It was a real pleasure to teach at the Catalysis Summer School at the Quingdao University of Petroleum (China, summer 2017).  
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Mar 17
by ZFreixa in Sin categoría 0 comments

Photo-tunable hydrogen generation

Our first example of a photo-controled catalyst for hydrogen generation from ammonia-borane just published in Dalton Transactions.  Eight new ruthenium(II) half-sandwich complexes containing azobenzene-appended pyridine (1), bipyridine (2–5) and phosphine (6 and 7) ligands have been synthesized and fully characterized. UV-vis spectroscopic studies showed that the trans-to-cis photoisomerization was strongly inhibited upon coordination to the metal centre in azopyridine-derived ligands 1 and 2, but it remained efficient in azobenzene-appended bipyridine (3–5) and phosphine (6 and 7) ligands. The complexes were tested as precatalysts for photo-controlled hydrogen generation by hydrolytic decomposition of ammonia-borane (AB). In situ irradiation of the reaction mixtures of compounds [Ru(p-Cym)(6)Cl]Cl and [Ru(p-Cym)(7)Cl]Cl induced a clear change in the catalytic reaction rate, serving as a proof of concept for light-controlled hydrogen generation.
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Feb 04
by ZFreixa in Meetings, People, Quimica, seminar, Sin categoría, Zoraida 0 comments tags: lectures, Meetings, seminars, UAB, Zoraida

Seminar at UAB

It was a nice day, meeting friends and colleagues. Thanks for the invitation!
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Ene 21
by ZFreixa in Meetings, People, Quimica, Zoraida 0 comments tags: Meetings

First CTQ2015-65268-C2 Workshop

On Thrursday 12th of January the first workshop on the progress of our Coordinated Project (CTQ2015-65268-C2) H2MET2015 was held in San Sebastián at UPV-EHU. All the researchers involved in the project presented their latest results. External researchers from the Department were also invited to contribute.
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Sep 25
by ZFreixa in Entrevista, Quimica, Sin categoría, Zoraida 0 comments tags: Entrevista, Investigación, Química, Universidad, Zoraida

En el mapa de la ciencia

Muchos no se conocen, pero cuando el fotógrafo les pide que hablen entre ellos para parecer más naturales no lo dudan ni un momento y comienzan a conversar como viejos amigos. Es como si tuvieran algo en común y ciertamente lo tienen, porque las ocho personas que se han citado en el centro Joxe Mari Korta para participar en una sesión fotográfica son investigadores. Faltan dos que no han podido acudir al encuentro por motivos de trabajo pero no por ello dejarán de salir en estas páginas. Son diez investigadores del más alto nivel que han venido a trabajar a Gipuzkoa atraídos por la fundación Ikerbasque y forman parte del grupo de 125 personas procedentes de veinte países que se han incorporado de forma permanente a las universidades y centros de investigación del País Vasco. Su aportación se puede medir de forma económica ya que, según la fundación, los científicos contratados por Ikerbasque han logrado un retorno para Euskadi de 17,5 millones de euros, lo que supone que por cada euro invertido por el Gobierno Vasco en esta entidad se obtienen dos euros. Es una aportación importante pero, sobre todo, estos diez investigadores que se dedican a ramas tan diversas […]
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