A new class of task-specific imidazolium salts and ionic liquids and their corresponding transition-metal complexes for immobilization on electrochemically active surfaces
Adding to the versatile class of ionic liquids, we report the detailed structure and property analysis of a new lass of asymmetrically substituted imidazolium salts, offering interesting thermal characteristics, such as liquid rystalline behavior, polymorphism or glass transitions. A scalable genera...
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| Andre forfattere: | , , , , , , |
| Format: | article |
| Sprog: | engelsk |
| Udgivet: |
2022
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| Fag: | |
| Online adgang: | https://hdl.handle.net/20.500.12008/37936 |
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| Summary: | Adding to the versatile class of ionic liquids, we report the detailed structure and property analysis of a new lass of asymmetrically substituted imidazolium salts, offering interesting thermal characteristics, such as liquid rystalline behavior, polymorphism or glass transitions. A scalable general synthetic procedure for N-polyaryl-N’-alkyl-functionalized imidazolium salts with para-substituted linker (L) moieties at the aryl chain, namely LPhmImHR]+ (L=Br, CN, SMe, CO2Et, OH; m=2, 3; R=C12, PEGn; n=2, 3, 4), was developed. These imidazolium salts were studied by single-crystal X-ray diffraction (SC-XRD), NMR spectroscopy and thermochemical methods (DSC, TGA). Furthermore, these imidazolium salts were used as N-heterocyclic carbene (NHC) ligand precursors for mononuclear, first-row transition metal complexes (MnII, FeII, CoII, NiII, ZnII, CuI, AgI, AuI) and for the dinuclear Ti-supported Fe-NHC complex [(OPy)2Ti(OPh2ImC12)2(FeI2)] (OPy=pyridin-2-ylmethanolate). The complexes were studied concerning their structural and magnetic behavior via multi-nuclear NMR spectroscopy, SC-XRD analyses, variable temperature and field-dependent (VT-VF) SQUID magnetization methods, X-band EPR spectroscopy and, where appropriate, zero-field 57Fe Mössbauer spectroscopy. |
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