Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Spectroscopy of Metal Clusters
MO 15.6: Vortrag
Mittwoch, 13. März 2024, 16:00–16:15, HS 3042
The highest oxidation states of iridium probed by soft x-ray absorption spectroscopy — •Joao P. M. de Arcanto1, M. da Silva Santos1,2, V. Zamudio-Bayer1, S. Kruse1,3, M. Timm1, M. Flach1,2, O. S. Ablyasova1,2, K. Hirsch1, R. Medel4, S. Riedel4, and J. T. Lau1,2 — 1HZB, Berlin, Germany — 2Universität Freiburg, Germany — 3HU, Berlin, Germany — 4FU, Berlin, Germany
Iridium stands out prominently in the pursuit of higher oxidation states (OS). Recently, a combined theoretical and experimental effort has confirmed the existence of Ir in the OS +VII, +VIII, and the highest known OS for an element, +IX with 5d2, 5d1 and 5d0 local electron configuration, but only a few compounds are known [1]. Utilizing the potential of the Ion Trap endstation at the beamline UE52-PGM of the BESSY II synchrotron radiation facility, our group has successfully generated a series of cationic iridium oxides [IrOn]+ (n = 0-4) in the gas phase using a magnetron sputtering source. Employing a mass filter, Ir species of interest are selected and cooled in an ion trap. We performed X-ray absorption spectroscopy at the iridium N3-edge allowing to study the 5d derived valence states as well as the oxygen K-edge, facilitating a comparative analysis across the series of iridium-oxo species [2]. [1] Wang et al., Nature 514, 475 (2014) [2] Da Silva Santos et al., Angew. Chem., 61, no. 38, e202207688, 2022
Keywords: oxidation states; iridium oxides; x-ray absorption spectroscopy; ion trap; mass spectrometry