Neue funktionelle ionische Flüssigkeiten für die potentielle Anwendung als Metallextraktor oder als Additiv für elektrochemische Zellen

In this thesis, both the coordination behavior of oxamic and thiooxamic anions has been investigated, as ILs based on these anions can potentially be useful for the extraction and separation of metal ions, and the synthesis and redox chemistry of new salts for use in electrochemical cells are presented. The first part of this thesis deals with the coordination chemistry of diorganooxamate ions, which were used in ILs for metal extraction. Complexes of N,N-diethyloxamates were prepared with copper(II), zinc(II), aluminum(III), gallium(III), indium(III), tin(IV) and dysprosium(III). Furthermore new, high purity ILs based on thioderivatives of the oxamic anion were prepared and their coordination chemistry was investigated. In the second part of this thesis new ionic compounds for the potential use as additives in electrochemical cells have been presented. Firstly, new lithium salts were synthesized, whose structures are similar to LiBOB. Therefore the use as SEI-builder is a potential field of application. Additionally three groups of potential redox mediators were investigated. The first group comprises imidazolium- and phosphonium-based, dicationic dichalcogenides. The second investigated system of redox mediators are new, stable ferrocenylsulfonium-based ILs and the last one cobaltocene-based phosphonium salts. The developed metallocene-based salts might be useful as redox mediators for DSSCs, as redox electrolytes in supercapacitors and redox-flow batteries or as overcharge protection additives in batteries.