@phdthesis{Remenyi2006, author = {Remenyi, Christian}, title = {Density Functional Studies on EPR Parameters and Spin-Density Distributions of Transition Metal Complexes}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-19848}, school = {Universit{\"a}t W{\"u}rzburg}, year = {2006}, abstract = {In dieser Arbeit wurden EPR-Parameter und Spindichteverteilungen von {\"U}bergangsmetallkomplexen mit Hilfe der Dichtefunktionaltheorie (DFT) berechnet. Um das Potential der DFT bei der Beschreibung solcher Systeme zu zeigen, wurden mehrere Validierungsstudien durchgef{\"u}hrt, die in den Kapiteln 3-5 vorgestellt werden. Die Kapitel 6-8 besch{\"a}ftigen sich dagegen eher mit konkreten chemischen Fragestellungen, die einige biologisch relevante {\"U}bergangsmetallkomplexe betreffen.}, subject = {Dichtefunktionalformalismus}, language = {en} } @phdthesis{HasenstabRiedel2006, author = {Hasenstab-Riedel, Sebastian}, title = {The Highest Oxidation States of the 5d Transition Metals : a Quantum-Chemical Study}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-19402}, school = {Universit{\"a}t W{\"u}rzburg}, year = {2006}, abstract = {The theoretical work presented in this thesis is concerned with the highest possible oxidation states of the 5d transition metal row. Based on a validation study of several DFT functionals against accurate coupled-cluster CCSD(T) methods we will present calculations on a series of new high oxidation state HgIV species. Quantum-chemical calculations have also been applied to various fluoro complexes of gold in oxidation states +V through +VII to evaluate the previously claimed existence of AuF7. The calculations indicate clearly that the oxidation state (+V), e.g., in [AuF5]2, remains the highest well-established gold oxidation state. Further calculations on iridium in oxidation state (+VII) show that IrF7 and IrOF5 are viable synthetic targets, whereas higher oxidation states of iridium appear to be unlikely. Structures and stabilities of several osmium fluorides and oxyfluorides were also studied in this thesis. It is shown that homoleptic fluorides all the way up to OsF8 may exist. Combining the results of the most accurate quantum-chemical predictions of this thesis and of the most reliable experimental studies, we observe a revised trend of the highest oxidation states of the 5d transition metal row. From lanthanum (+III) to osmium (+VIII), there is a linear increase of the highest oxidation states with increasing atomic number. Thereafter, we observe a linear descent from osmium (+VIII) to mercury (+IV). We will also present a short outlook to the transition metals of the 3d and 4d row and their highest reachable oxidation states.}, subject = {Oxidationszahl}, language = {en} }