Fixation of spin crossover complexes on surfaces

Published on April 7, 2015

Functionalization of surfaces with spin crossover complexes is an intensively studied topic.

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Starting from dinuclear iron(III)-salten complexes [Fe(salten)-(pyS)]2(BPh4)2 and [Fe(thiotolylsalten)(NCS)]2 with disulfide-containing bridging ligands, the corresponding mononuclear complexes [Fe(salten)(pyS)]+ and [Fe(thiotolylsalten)-(NCS)] were covalently attached to Au(111) surfaces and analyzed with Infrared reflection absorption spectroscopy (IRRAS).
In comparison with the bulk material data of the [Fe(salten)pyS]+ complexes , the surface vibrational spectra show an anomaly regarding the geometry of adsorbed complexes. The salten-ligand is partially decoordinated from the Fe(III)center and one of its phenolate arms binds to the Au(111) surface. To find a system, which retains the geometry on the surface, [Fe(thiotolylsalten)NCS] monolayers were prepared and also investigated on the surface. Here no anomaly was observed, which indicates that the coordination sphere of the complex in the bulk is retained on the surface. The implications of these results with respect to the preparation of surface-adsorbed monolayers of functional transition-metal complexes are discussed.

Tuczek Group | Christian Albrechts-University of Kiel, Germany

Felix Tuczek is a Chemistry Professor at the institute of inorganic chemistry, Christian-Albrechts-University of Kiel. One of his research topics are spin crossover systems within the collaborative research centre 677.

Hanne Jacob is a PhD student in the working group of Prof. Dr. Tuczek. The research of her phd thesis is about the Fixation of potential spin crossover systems on gold surfaces and the surface spectroscopic characterization.

Alexander Schlimm is a master student in the working group of Prof. Dr. Tuczek. His Master thesis is about the fixation of transition metal complexes on gold surface via “click-reaction”.

Sources

The original research article is published in the Open Access Beilstein Journal of Organic Chemistry and is part of the Thematic Series Chemistry in flow systems II.

Bou-Hamdan, F. R.; Lévesque, F.; O’Brien, A. G.; Seeberger, P. H., Continuous flow photolysis of aryl azides: Preparation of 3H-azepinones, Beilstein J. Org. Chem. 2011, 7, 1124–1129. doi:10.3762/bjoc.7.129

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