IFIS - LITORAL   24734
INSTITUTO DE FISICA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Reactivity of metal-organic coordination networks for CO2 activation
Autor/es:
D. HURTADO SALINAS; G RUANO; K KERN; M. LINGENFELDER
Lugar:
Honolulu - Hawaii
Reunión:
Congreso; PACIFCHEM 2015; 2015
Institución organizadora:
American Chemical Society
Resumen:
Photosynthesis, the model system for energy conversion, uses CO2 as its starting reactant to convert solar energy into chemical energy, i.e. organic molecules or biomass. The first and rate-determining step of this process is the immobilization and activation of CO2, a carboxylation reaction catalyzed by the enzyme RuBisCO. The active center of the RuBisCO is Mg2+ ion surrounded by amino acid residues that anchor the ribulose and provide the CO2 as a cofactor bonded to a lysil residue in the surroundings of Mg2+. In this way, inorganic carbon is transformed into organic carbon-based molecules.Metal-organic structures observed in nature, can be replicated in the laboratory by self-assembly. Scanning Tunneling Microscopy (STM) is a powerful tool that offers a dynamical structural insight to study the self-assembly of nanostructures at conductive surfaces. Our group has developed a large expertise in tailoring and characterizing 2D hybrid networks consisting of metal nodes bonded to organic bridging ligands. These structures hold a great potential to mimick active centers of enzymes due to their tunability of metal centers, organic linker, pore size and physical/chemical properties.Inspired by the active site of RuBisCO, we designed the first network using an alkaline earth metal (Group 2): magnesium (Mg). Here we present a method for producing stable networks of Mg and organic molecules by direct deposition onto a clean metal substrate. We track their reactivity and dynamic response to CO2, O2 and H2 by STM and X-Ray Photoelectron Spectroscopy (XPS). Specific phase transformations are identified upon gas exposure at room temperature.
rds']