Improved Synthesis of 4,4′-Disubstituted-2,2′-Bipyridines

Electro‐ and Photo‐driven Reduction of CO2 by a trans‐(Cl)‐[Os(diimine)(CO)2Cl2] Precursor Catalyst: Influence of the Diimine Substituent and Activation Mode on CO/HCOO− Selectivity

“…This result differs completely from that obtained from as eminal study performed with am ixture of [Ru(bpy) 3 ] 2 + andt he parent Ru carbonyl complex (i.e.,[ Ru(bpy)(CO) 2 Cl 2 ]) as catalysta s under similarc onditions (DMF + TEOA) this system favors markedly the formation of HCOO À . [11a] Although it is now generally acceptedt hat the selectivity of the reactiond epends strongly on the activation energy mode (light or electrode) and reactionm edia (acidico rb asic), [30] it seemsf rom our studies that it depends also on the metal center( Ru or Os) of the carbonyl complex. To try to explain some of the mismatches for the [Ru(bpy)(CO) 2 Cl 2 ]c atalyst, Ishida et al [11d] have studied the influence of the catalyst concentration on the selectivity of the reduction with the [Ru(bpy) 3 ] 2 + /[Ru(bpy)(CO) 2 Cl 2 ]s ystem in DMA as solvent (with some H 2 O), insteado fD MF,i nw hich oligomerf orms of the Ru carbonyl catalyst are more soluble.…”

“…This result differs completely from that obtained from a seminal study performed with a mixture of [Ru(bpy) 3 ] 2+ and the parent Ru carbonyl complex (i.e., [Ru(bpy)(CO) 2 Cl 2 ]) as catalyst as under similar conditions (DMF+TEOA) this system favors markedly the formation of HCOO − . Although it is now generally accepted that the selectivity of the reaction depends strongly on the activation energy mode (light or electrode) and reaction media (acidic or basic), it seems from our studies that it depends also on the metal center (Ru or Os) of the carbonyl complex. To try to explain some of the mismatches for the [Ru(bpy)(CO) 2 Cl 2 ] catalyst, Ishida et al .…”

“…C1 and C2 were synthesized by following the procedure already published. [14] C3 and C4 were prepared by as imilar procedure, starting from commercially available ligands 4,4'-di-tert-butyl-2,2'dipyridyl (Aldrich) for C3 and 4,4'-di-isopropylacetate-2,2'-dipyridyl [30] for C4.I natypical experiment, OsCl 3 (250 mg) was dissolved in ethanol (40 mL) in at wo-necked reaction vessel. Am etal plate of iron or cobalt was placed in the vessel and the solution was heated at reflux in \C Os tream overnight.…”

The dichotomy in the DNA-binding behaviour of ruthenium(II) complexes bearing benzoxazole and benzothiazole groups

“…Silica Gel 60 PF 254 (Merck), Sephadex LH20 (Fluka) and SP Sephadex C-25 (Aldrich) were used for chromatographic purification of the metal complexes. 2,2 0 -Bipyridine-4,4 0 -dicarboxylic acid and 2,2 0 -bipyridine-5,5 0 -dicarboxylic acid were prepared from 4,4 0 -dimethly-2,2 0 -bipyridine (Fluka) and 5,5 0 -dimethly-2,2 0 -bipyridine (Aldrich) respectively via KMnO 4 oxidation [21,26]. cis-[Ru(bpy) 2 Cl 2 ]Á(H 2 O) 2 was prepared by a standard published procedure [27].…”

4,4’-Bis(4-octylphenoxy)-2,2’-bipyridine

“…Much attention is currently devoted to the search for new molecular materials for optoelectronics due to their potential applications in photovoltaic [1] or light-emitting devices [2][3][4]. Especially, derivatives of 2,2'-bipyridine [5][6][7][8][9][10][11][12][13][14] have received much attention due to their potential for metal coordination to form polypyridyl metal complexes, particularly of ruthenium. The complex of 4,4'-dicarboxylbipyridine with ruthenium showed very promising potential in dye-sensitized solar cells (DSSC) [15][16][17].…”