Trinuclear complexes and coordination polymers of redox-cctive guanidino-functionalized aromatic (GFA) compounds with a triphenylene core
Herein, we report on the synthesis, redox activity, and coordination chemistry of 2,3,6,7,10,11-hexakis(tetramethylguanidino)triphenylene. CV measurements indicated that the new compound could be oxidized in three separate reversible two-electron oxidation events. The HOMO and LUMO energies were est...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
September 4, 2014
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| In: |
Inorganic chemistry
Year: 2014, Jahrgang: 53, Heft: 18, Pages: 9876-9896 |
| ISSN: | 1520-510X |
| DOI: | 10.1021/ic501482u |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/ic501482u
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| Verfasserangaben: | Anna Lebkücher, Christoph Wagner, Olaf Hübner, Elisabeth Kaifer, and Hans-Jörg Himmel |
| Zusammenfassung: | Herein, we report on the synthesis, redox activity, and coordination chemistry of 2,3,6,7,10,11-hexakis(tetramethylguanidino)triphenylene. CV measurements indicated that the new compound could be oxidized in three separate reversible two-electron oxidation events. The HOMO and LUMO energies were estimated from the oxidation wave and the onset of absorption in the UV/vis spectrum. Our discussion also includes the related new compound 2,3,6,7,10,11-hexakis(N,N′-dimethylethyleneguanidino)triphenylene. Then trinuclear CuI and CuII complexes of the new triphenylene ligands were characterized, and their electronic properties are discussed. In contrast to previously studied redox-active GFA ligands, oxidation of trinuclear copper(I) iodide complexes with I2 leads to copper instead of ligand oxidation. In the tetra-coordinated CuII complexes, the coordination mode is intermediate between tetrahedral and square planar. The optical properties of the complexes were studied, and low-energy electronic transitions were assigned to ligand-to-metal charge-transfer (LMCT) excitations. We then extended our analysis to trinuclear NiII and CoII complexes. The magnetic coupling mediated through the triphenylene ligand in the trinuclear CuII and CoII complexes was studied by SQUID magnetometry, revealing ferromagnetic coupling of the spin centers and different degrees of spin delocalization into the guanidino groups. Finally, we show that the GFA ligands could be linked to one- or two-dimensional coordination polymers and porous materials with a layer structure by reaction with silver halides. |
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| Beschreibung: | Gesehen am 07.08.2020 |
| Beschreibung: | Online Resource |
| ISSN: | 1520-510X |
| DOI: | 10.1021/ic501482u |