X-Ray absorption spectroscopy of Fe complexes on surfaces [Elektronische Ressource] : electronic interactions and tailoring of the magnetic coupling / von Matthias Bernien

X-RayAbsorptionSpectroscopyofFeComplexesonSurfaces:ElectronicInteractionsandTailoringoftheMagneticCouplingIm Fachbereich Physikder Freien Universität Berlineingereichte Dissertation vonMatthiasBernienMai 2009st1 referee: Prof. Dr. Wolfgang KuchFreie Universität Berlinnd2 referee: Prof. Dr. Martin WeineltMax-Born-Institutrd3 referee: Prof. Dr. Hans-Peter SteinrückFriedrich-Alexander-Universität Erlangen-NürnbergthSubmission of thesis: 29 of May 2009thDay of disputation: 28 of October 2009ABSTRACTWithin this thesis, two classes of transition metal complexes are studiedon surfaces. Firstly, monomolecular layers of Fe(II) spin-crossover (SCO)complexes, prepared by in-situ sublimation onto Au(111) substrates and byself-assembly on Au(111)/mica, are investigated by means of X-ray absorp-tion spectroscopy (XAS). For a multilayer of Fe(phen) (NCS) and phenan-2 2throline molecules on Au(111), a partly reversible SCO transition is demon-strated. It is found that the transition is suppressed if the Fe(phen) (NCS)2 2molecules are in direct contact with the Au(111) surface, possibly due to achemical reaction of their ligands with the gold substrate. The intact depo-sition of Fe(bp) is demonstrated, being relatively unperturbed even when2in direct contact with the Au(111) surface.