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Area A: unusual binding situations in molecular fluorides

Head: Prof. Dr. Konrad Seppelt

The four subprojects of area A aim at investigating the elemental fluorides of group 6 to 9 of the fifth and of groups 6 to 10 of the sixth period in detail. Even though the hexafluorides WF6, ReF6, OsF6, PtF6, and IrF6 have been isolated, their electronic structure is still not finally solved even after 50 years. X-ray spectroscopy using a tunable light source is a versatile tool to study the local electronic structure as well as the fragmentation upon core level excitation in an element specific manner. Aided by theory the project focuses on osmium and rhenium hexafluorides as these are considered possible reagents for the one electron oxidation of hexafluorobenzene, which in turn might allow for structural investigations on the C6F6+-radical cation. Apart from the abovementioned metals the chemistry of technetium will also be considered as only very little is known up to date. Only a few technetium compounds with oxidation state “+7“ were described so far. This project aims at preparing and structurally characterizing not only TcF4, but also other fluorides with oxo, nitrido, imido, nitrosyl and possibly with a thionitrosyl-core with oxidation states ranging from “+1” to “+6”. Another synthetic project focus on other element fluorides in low oxidation states. These are often rather unstable (IF3, SF2) and correspondingly only poorly characterized or even unknown (CuF, AuF, AuF2, PtF2). A special emphasize is on different organoselenium- and –telluriumfluorides as well as on halogen fluorides.

Humboldt Universität zu Berlin