Synthesis, characterization and interactions with 9-methylguanine of ruthenium(II) η6-arene complexes with aromatic diimines
| Autor: | Andreas Kourtellaris, Achilleas Garoufis, Konstantinos Ypsilantis, Theodoros Tsolis |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
Chemistry Ligand Quinoline chemistry.chemical_element 010402 general chemistry Ring (chemistry) Mass spectrometry 01 natural sciences 0104 chemical sciences Ruthenium Inorganic Chemistry chemistry.chemical_compound Crystallography Materials Chemistry Shielding effect Physical and Theoretical Chemistry Benzene Diimine |
| Zdroj: | Polyhedron. 149:45-53 |
| ISSN: | 0277-5387 |
| Popis: | The complexes of the formula [(η6-arene)Ru(L)Cl]PF6, where arene is benzene (bz) or p-cymene (cym) and L is 2,(2′-pyridyl)quinoline (pqn), were synthesized and characterized by means of NMR spectroscopic techniques, HR-ESI mass spectrometry and, in the case of [(η6-cym)Ru(pqn)Cl]PF6, by X-ray single crystal diffraction. Their resistance in hydrolysis was also studied. A comparative NMR study of their 9-methylguanine (9-MeG) complexes, [(η6-arene)Ru(pqn)(9-MeG)](PF6)2, with similar diimine complexes revealed that the unimpeded rotation of 9-MeG is hindered by interactions between the 9-MeGO6 and the p-cymene aromatic proton H2 and, by the bulky shape of the pqn. This conformation forces the 9-MeGH8 to be in close proximity to the aromatic ring system of pqn. NMR spectroscopic techniques lead to the conclusion that the strong shielding effect on 9-MeGH8 depends on the extension of the aromatic system of the ligand. Also, we conclude that the strong deshielding on the 9-MeGNH1 is influenced by both the N7 ruthenation of 9-MeG and the addendum electron density in the 9-MeG ring system, due to the proximity to the aromatic ring system of pqn. |
| Databáze: | OpenAIRE |
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