Abstract
AbstractA series of ruthenium tris(β‐diketonate) complexes was investigated by using electrochemistry, UV/Vis spectroscopy, 1H NMR and 13C NMR spectroscopy and FAB mass spectroscopy. Several new mononuclear mixed‐ligand ruthenium(III) complexes were prepared: with three dibenzoylmethanate ions (dbm) {[Ru(dbm)3] (1)}, one or two acetylacetonate ions (2,4‐pentanedionate, acac) {[Ru(dbm)2(acac)] (2), [Ru(dbm)(acac)2] (3)}, two acetonitrile ligands {[Ru(dbm)2(CH3CN)2][CF3SO3] (4)} or a functionalized acetylacetonate ion {[Ru(dbm)2(acac‐I)] (5) (acac‐I = 3‐iodo‐2,4‐pentanedionate ion), [Ru(dbm)2(acac‐Br)] (6) (acac‐Br = 3‐bromo‐2,4‐pentanedionate ion)}. In addition, X‐ray structures for complexes 1, 2, 3, 4 and 6 were determined. Scanning tunnelling microscopy measurements at liquid He temperature and in anultra‐high vacuum (UHV‐STM) were conducted on complex 1 on a Ag(111) surface. This indicates that the complex can be successfully evaporated and observed after adsorption onto a metallic substrate. Analysis of the STM images, supported by adsorption and STM image calculations, demonstrates that the molecules exist in two stable forms when adsorbed onto the surface.
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