Cobalt polypyridine complexes

Schwarz HA, Creutz C, Sutin N. (1985) Homogeneous catalysis of the photoreduction of water by visible light. 4. Cobalt(I) polypyridine complexes. Redox and substitutional kinetics and thermodynamics in the aqueous 2,2 -bipyridine and 4,4 -dimethyl-2,2 -bipyridine series studied by the pulse-radiolysis technique. Inorg Chem 24 433H39. 

Nitric oxide and iron nitrosyl complexes have been observed in the reduction of nitrite by bacterial nitrite reductases, which contain iron chlorin or iron isobac-terichlorin [151]. A specific nitric oxide reductase also exists to convert NO to nitrous oxide [9]. Iron complexes of chlorins, isobacteriochlorins, and porphyrins, as well as ruthenium and osmium polypyridines, and cobalt and nickel... 

The disubstituted polypyridine derivatives, 4, 4" -bis(methylthio)-2,2 6, 2" 6", 2" 6", 2""-quinquepyridine (45) and 4, 4""-bis(methylthio)- 2,2 6, 2" 6",2" 6", 2"" 6 ", 2 ""-sexipyridine (46), in which the alkylthio groups are present on the 4-positions of the penultimate pyridines (with respect to each end) also form bimetallic double-stranded helical complexes with iron(II), cobalt(II), nickel(II), zinc(II) and palladium(II). With the first of these ligands, the palladium species is of type... 

Professor A.P. Sadimenko of the University of Fort Hare, Repubhc of South Africa, has continued his series on organometallic complexes by summarizing the organometallic complexes formed by metals of the cobalt (cobalt, rhodium, iridium) and nickel (nickel, palladium, platinum) groups with polypyridines. This is the first summary of the numerous organic complexes that these metals form with polypyridines. 

The electron self-exchange rate constant for the [Cr(CNdipp)6] couple (CNdipp = 2,6-diisopropylphenyl isocyanide) in CD2CI2 has been measured between -89 and +22 °C using H NMR line-broadening techniques, with an extrapolated value of 1.8 x 10 M s determined for 25 The kinetics of the outer-sphere oxidations of tris(polypyridine)chromium(II) complexes by a series of tris(chelate)cobalt(III) species have been studied in aqueous solution. " The cross-reaction rate constants obey the Marcus relationship, with the exception of [Co(bpy)3] " and [Co(phen)3] ", for which mild nonadiabaticity (/[Pg.18]

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