Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality

MO 10.10: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Electrophilic and Nucleophilic Oxygen in Cationic Gold-Oxygen Cluster Complexes — •Alexander P. Woodham and André Fielicke — Institut für Optik und Atomare Physik, Technische Universität Berlin, Germany

Clusters, small aggregates of atoms or molecules, exhibit properties which are often unique and unlike those of either the bulk material or the atom. One of the most well-known examples is that of gold clusters which, in contrast to the highly inert bulk phase, play part in a range of oxidation reactions utilizing molecular oxygen as a feedstock. The origin for this change in reactivity is poorly understood and better characterization of the gold cluster complexes with oxygen may reveal structural or mechanistic details. Recent work has focused on the anionic and neutral clusters as the cationic clusters are thought to be unreactive towards molecular oxygen. In this poster, however, we present data for the binding and activation of molecular oxygen by cationic gold clusters. Spectroscopic characterization from infrared multiple photon dissociation spectroscopy (IR-MPD) allows determination of the oxidation state of bound oxygen molecules and unequivocally identifies the presence of both electron rich and electron poor adsorbates, even within the same cluster-complex composition.