Rhodium bipyridine complexes

Electro-generated and regenerated bis(bipyridine)rhodium(I) complexes were able to catalyze the selective non-enzymatically coupled electrochemical generation of NADH from NAD . The direct cathodic reduction even at very negative working potentials leads to the formation of large amounts of enzymatically inactive NAD dimers, while the indirect electrochemical reduction via the rhodium complex acting as... 

FN20)ReC 2HH, Rhenium, (2,2 -bipyridine)-tricarbonylfluoro-, 26 82 FO2C7H, Benzoic acid, 3-fluoro-, rhodium complex, 27 292... 

The Rh(III) organometallic complex 39 (Scheme 11.7) conjugated to biotin through the carboxyl group present on the bipyridine ligand, exhibited emission similar to that of complex 38 (i.e., low emission at 298 K), and also accumulated mainly in the cytoplasm of HeLa cells [110]. This small number of examples is obviously not enough to establish the potential interest of rhodium complexes for cell imaging. 

Very efficient reduction of NAD(P) with formate catalyzed by cationic rhodium complexes. /. Chem. Soc. Chem. Commun., 1150-1151 (d) Franke, M. and Steckhan, E. (1988) Tris(2,2 -bipyridyl-5-sulfonic add) rhodium(III), an improved redox catalyst for the light-induced and the electrochemically initiated enzymatic reduction of carbonyl compounds. Angeiv. Chem., Int. Ed., 27, 265-267 (e) Grammenudi, S., Franke, M., Vogde, F., and Steckhan, E. (1987) The rhodium complex of a tris(bipyridine) ligand - its electrochemical behavior and frmction as mediator for the regeneration of NADH from NAD. /. Ind. Phenom. Macrocycl. Chem., 5,695-707 (f) Hollmaim, F., Kleeb, A., Otto, K., and Schmid, A. (2005)... 

A similar type of immobilization was obtained by reacting the phosphonylated 2,2 -bipyridine ligand depicted in Figure 42.10 with excess titanium alkoxide. Rhodium and iridium complexes of this immobilized ligand showed activity for... 

Several dyes or transition-metal complexes can be used as redox mediators in indirect electrolyses. Pentamethylcyclopentadienyl-rhodium(bipyridine) complexes [Cp Rhnl(bpy)(H20)]2+ 9 [33], which were pioneered and intensively studied by Steckhan et al. [34—36], are very versatile catalysts for the reduction of cofactors. 

Scheme 43.3 Cofactor reduction using the pentamethyl cyclopentadienyl rhodium(bipyridine) complex (9/10).

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