Hannover 2020 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 4: Clusters and Molecules

MS 4.3: Talk

Tuesday, March 10, 2020, 14:45–15:00, f128

A gas-phase soft X-ray study on the metal active site of metalloporphyrins and metalloproteins — •Kaja Schubert¹, Kaan Atak¹, Lucas Schwob¹, Simon Dörner¹, Martin Timm², Christine Bülow², Vicente Zamudio-Bayer², Xin Wang³, Tobias Lau², Thomas Schlathölter³, and Sadia Bari¹ — ¹Deutsches Elektronen-Synchrotron, Hamburg — ²Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz Zentrum Berlin für Materialien und Energie, Berlin — ³Zernike Institute for Advanced Materials, University of Groningen, Groningen

Metalloporphyrins (MPs) are organometallic molecules widely found in nature and composed of a porphyrin ring coordinating a metal ion in the ring's cavity center. Their particular electronic structure makes MPs ideally suited for a number of applications, from biological functions to the usage in electronic devices. Electronic structure and functional activity of MPs are determined by the type of the metal, its oxidation and spin state as well as axial ligands around the metal center. For understanding the properties of MPs, it is hence of great importance to probe the local electronic sturcture of the metal ion. In this study electrospray ionization (ESI) tandem mass-spectrometry and synchrotron-based light were combined and site-selective excitation at the metal L-absorption edges was used for probing the metal site of several MPs. Similar measurements were performed for the MP-containing protein cytochrome c (12.4 kDa).