Synthese neuartiger Pyrazolbasierter Liganden und deren Übergangsmetallkomplexe (English shop)

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Polynuclear transition metal complexes are of considerable interest in modern coordination chemistry because of their structural, magnetic, and potentially catalytic properties.
Stefan Fischer’s dissertation investigates the synthesis and characterization of novel pyrazole-based ligands and their transition metal complexes.
The research focuses on developing functionalized pyrazole structures capable of selectively coordinating different transition metal ions.
Initially, new thiosemicarbazide ligands and highly charged ligand systems combining pyrazole and EDTA structural motifs are synthesized.
In addition, novel bispyridylpyrazole ligands containing additional nitrogen donor functionalities are developed.
These ligand systems enable the formation of stable metal complexes with different coordination geometries and metal centers.
A total of 13 new coordination compounds are isolated, including mononuclear nickel complexes and polynuclear iron, zinc, nickel, manganese, and copper complexes.
Structural characterization is primarily performed using single-crystal X-ray diffraction, NMR spectroscopy, IR spectroscopy, and mass spectrometry.
Selected paramagnetic compounds are further investigated through UV/Vis spectroscopy and magnetic measurements.
A pentanuclear iron(III) cluster is characterized in greater detail using Mössbauer spectroscopy and magnetic investigations.
Particular attention is devoted to magnetic exchange interactions between neighboring metal centers.
The findings demonstrate how targeted ligand design enables the formation of different coordination environments and polynuclear metal structures.
The synthesized compounds provide a foundation for further investigations into biomimetic metal complexes and potential catalytic applications.