Bipyridyl redox properties

Raman spectroscopy metal in water complexes, 309 Rare earth complexes acetylacetone synthesis, 377 guanidinium, 282 hydroxamic acids, 506 Redox properties bipyridyl metal complexes, 90 Reductive coupling nitrile metal complexes, 265 Resorcinol, 2,4-dinitro-metal complexes, 273 Rhenium complexes acetylacetone, 376 synthesis, 375, 378... 

Optical measurements have been reported for [Ru(bipy)3], [Ru(bipy)2(biq)f, and [Ru(biq)3] (biq = 2,2 -biquinolyl) together with the temperature dependence (84—330 K) of the luminescence emission. The behaviour of the three complexes is rationalized in terms of states derived from a simple orbital model. A description of the photophysical and redox properties of the luminescent complexes [RuLL L ] (where L = 2,2 -bipyridyl, L = 2,2, 2"-terpyridyl, and L" = phenothiazine, N-methylphenothiazine, thian-threne, or H2O) has appeared, and this suggests that states other than the luminescent state are populated. Coupling between dissimilar ligands in the excited states of [Ru(bipy) (phen)3 f, [Ru(bipy) L3 and... 

There is much interest in transition metal polypyridyl complexes, largely due to their numerous applications in a variety of fields (247-250). In particular, ruthenium(II) tris(2,2 -bipyridyl) has been one of the most extensively studied complexes of the last decade due to its chemical stability, redox properties, excited-state reactivity, and luminescent emission (251, 252). 

In the reduction with 2,2 -bipyridyl, redox reactions are absent and the limiting stage is the transfer of the 2nd electron, [AEo being —60 to —70 mV. Reduction of the nickel(II) complex with PPhs, ( PrO)3P, PhP(OBu)2, or (PhO)3P is limited by the transfer of the 1st electron and is accompanied by comproportionation (PPh3, AEo= 90 mV) and disproportionation reactions (phosphites, AEq< 0). The redox properties of some transition metal-cinnamonitrile cyclo-phosphazene derivatives, e.g., 107-109 have been stuoied by cyclic voltammetry (CV) and controlled potential electrolysis (CPE) in aprotic media. 

Ruthenium, tris(2,2 -bipyridyl)-chemical actinometer, 409 excited electronic states redox properties, 490 structure, 64... 

In collaboration with the Bond group [136], we have investigated the voltammetric properties of microcrystals of [Os(bpy)2 4-tet-Cl](Cl04) (Fig. 12) (where bpy is 2,2 -bipyridyl and 4-tet is 3,6-bis(4-pyridyl)-l,2,4,5-tetrazine) that are mechanically attached to macro- and microdisk electrodes. The complex is insoluble in water, allowing the solid-state redox properties to... 

Photoredox Organocatalysis. Photoredox catalysis is emerging as an extremely powerful tool in organic synthesis [103]. Photoredox catalysis relies on the ability of some compounds, such as ruthenium(II) tris(bipyridyl) complex (Ru(bipy)3 ), to absorb visible light affording a relatively kinetically stable excited species (usually in the triplet state) with enhanced redox properties (Scheme 2.22). 

McDevitt MR, Addison AW (1993) Medium effects on the redox properties of tris(2,2 -bipyridyl)ruthenium complexes. Inorg Chim Acta 204 141-146... 

The anion coordination properties of receptors such as compound [93] (Fig. 51) are currently under investigation. This molecule contains both a redox-active ruthenium bipyridyl moiety and also a cobaltocenium unit. This type of host has already been shown by 1H nmr and fluorescence emission spectroscopy to exhibit remarkable selectivity for the chloride anion in preference to dihydrogenphosphate (Beer and Szemes, 1995). 

---