Synthesis and spectroscopic characterization of ruthenium and osmium complexes with sterically hindering ligands. 2. Tris complexes with 2-(2'-pyridyl)quinoline and 2,2'-biquinoline

Ruthenium(II) Complexes with Three Different Diimine Ligands

“…The electronic absorption data for heteroleptic Ru(I1)-tris(diimine) complexes are summarized in Table 3. The spectra exhibit in the UV region strong bands due to ligand-centered transitions (n +n) [26] [27]. In the VIS region, they also show intense bands which can be attributed to MLCT transitions ('tZl+n*).…”

Ruthenium complexes of eilatin: face selectivity in octahedral geometry; synthesis of [Ru(bpy)2(eilatin)]2+ and [Ru(phen)2(eilatin)]2+

“…Both bpy and biq can serve as chelating ligands for various metals; however, their different steric bulk leads to different coordination behaviour. Thus, for instance, while both [Ru(bpy) 3 ] 2+ and [Fe(bpy) 3 ] 2+ are known compounds, the tris (biq) analogue is stable only for ruthenium, 5 while attempts to prepare the iron complex, [Fe(biq) 3 ] 2+ , have been unsuccessful. 6 Accordingly, eilatin is expected to behave as a bidirectional ligand exhibiting face preference, depending on the steric crowding around the metal: in sterically demanding geometries such as octahedral or square-planar, eilatin is expected to bind to the metal through its 'head', while in loose geometries such as tetrahedral, both the 'head' and the 'tail' of eilatin are expected to be able to bind.…”

Sodium lauryl sulfate-ruthenium(II) interactions: photogalvanic and photophysical behavior of ruthenium(II)-diimine complexes

“…The resulting photopotential (Figure 2b) is smaller and less reversible due to photoelectrochemistry and enhanced back electron transfer between Fe(II) and Ru(III) held together on the micellar surface. 28 The redox potentials for the excited states of the other three complexes are less favorable than for [Ru(bpy)3]2+,36 but the behavior of each complex is best explained alone. The photogalvanic trace for [Ru(bpy)(pyq)2]2+ in water (Figure 3) and the emission intensities following the photogalvanic experiment are consistent with each other, since large photochemical (Table III: (36) Akasheh, T. S.; Jibril, I.; Shraim, A. M" unpublished results.…”