Ru-Os complexes

FT-ICR, see Fourier-transform ion cyclotron resonance Fullerene[60], germanium-germanium addition, 10, 748 Fullerenes with cobalt, 7, 51 on cobalt Cp rings, 7, 73 inside metallodendrimers, 12, 401 microwave applications, 1, 334 Pd rc-complexes, 8, 348 Ru—Os complexes, 6, 830 with tungsten carbonyls, 5, 687 )2-Fullerenes, with platinum, 8, 634 Fulvalene actinide complex, synthesis, 4, 232 Fulvalene chromium carbonyls, synthesis and characteristics, 5, 264... 

Recently, in a theoretical study using TD-DFT, it was shown that the exciton CD for [M(phen)3]2+ (M = Fe, Ru, Os) complexes and related complexes is reproduced in good agreement with the experimental pattern, though for the latter two complexes the calculated charge transfer CD bands are in agreement with the experimental one, but not for the corresponding iron(II) complex.135,136... 

The trinuclear M3(CO)12 (M = Fe, Ru, Os) complexes have received some attention from experimentalists, but neither the electronic spectroscopy nor the photochemistry of these complexes have been investigated in detail. The recent report107)... 

Jukes RTF, Adamo V, Hartla F, Belser P, De Cola L. Electronic energy transfer in a dinu-clear Ru/Os complex containing a photoresponsive dithienylethene derivative as bridging ligand. Coord Chem Rev 2005 249 1327-35. 

Finally, electrode potential and acidity data were used by Ng et al. to study ligand effects on CpM(PR3)2H2 and TpM(PPh3)2(// -H2)+ (M = Ru, Os) complexes under similar conditions [31] these data are included in Table 3. The Ru-H BDE determined by Ng for CpRu(PPh3)2H2+ (Table 3, entry 19 289 kJ mol" ) is in near perfect agreement with that of Angelici (Table 2, entry 25 286 kJ mol ) but somewhat different from the value derived from Morris data (Table 3, entry 1 303 kJ moF ). The source of the discrepancy might partly be the assumptions and conversions made to align the pXa and electrochemical reference scales of the different solvents used. 

Fe3(CO)i2] was expected, but whereas reactions of the iron cluster normally lead to cleavage of the trimeric unit, the ruthenium analog seems to give stable trinuclear species. This was correlated with an increase in the stability of metal-metal bonds on descending the transition metal triad. For instance, when R = Et, Bu" or -in the case of osmium, Ph, the reaction in benzene or toluene under reflux affords [M3(CO)io( -H)(//-SR)] (M = Ru, Os) complexes. The structure of [Os3(CO)io(//-H)(/i-SEt)], synthesized in octane under reflux, has been reported. ... 

Electronic energy transfer in a dinuclear Ru/Os complex containing a photoresponsive dithienylethene derivative as bridging ligand 05CCR(249)1327. 

Os and Re complexes 32-35 (Chart 5.7) are systems in which the metal centers are attached in a pendant fashion to a bipyridine-containing conjugated oligomer [45]. In the case of the mixed Ru-Os complex 33, energy transfer from Ru to Os is efficient and results in Os-based emission. The authors ascribed this to a Dexter-type double-electron transfer , mediated by the conjugated ligand. 

For the Ru-Os mixed-metal systems, [(ttpy)Ru(tpy-ph -tpy)Os(ttpy)] , energy transfer between metal centers was examined by luminescence studies [30]. For all three of the Ru-Os complexes, it was found that there was quantitative energy transfer from the ruthenium center to the osnoium center and the rate of energy transfer was extremely fast, i.e., > 10 s at room temperature [31]. 

Figure 2.20. The anthracene-bridged binuclear Ru"/Os" complex and the corresponding oxygenated product.

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