کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1306925 | 975109 | 2010 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Organoosmium complexes of imidazole-containing chelate acceptor ligands Organoosmium complexes of imidazole-containing chelate acceptor ligands](/preview/png/1306925.png)
The complexes [(L)Os(η6-Cym)Cl](PF6), Cym = p-cymene and L = bis(1-methylimidazol-2-yl)ketone (bik) or bis(1-methylimidazol-2-yl)glyoxal (big), were obtained and characterized with respect to spectroscopy, crystal structure (big complex) and (spectro)electrochemical behaviour at variable temperatures. DFT calculations confirm the structure of [(big)Os(η6-Cym)Cl]+ with imidazolyl-N-bonded OsII in a boat-shaped seven-membered chelate ring with small N–Os–N angles (<84°). Reduction of this compound proceeds reversibly to a neutral complex of the α-semidione radical anion ligand big−; EPR and IR spectroelectrochemistry indicate very little participation from the heavy metal in the spin distribution. The analogous [(bik)Os(η6-Cym)Cl]+ could not be reduced reversibly to the ketyl radical complex but displayed a more reversible oxidation at high potential.
The complexes [(L)Os(Cym)Cl](PF6), Cym = p-cymene and L = bis(1-methylimidazol-2-yl)ketone (bik) or bis(1-methylimidazol-2-yl)glyoxal (big), were obtained and characterized with respect to spectros- copy, crystal structure (big complex) and (spectro)electrochemical behaviour.Figure optionsDownload as PowerPoint slide
Journal: Inorganica Chimica Acta - Volume 363, Issue 12, 15 October 2010, Pages 3070–3077