Cobalt complex charge-transfer process

We may conclude that the divalent cobalt ions move out into the large cavities upon adsorption of NH3 to form a hexacoordinate cobalt(II)-ammonia complex. Following adsorption of 02 in the ammoniated Co(II)Y zeolites, oxygen enters the coordination sphere of the Co2+ ions. This is accompanied by a charge-transfer process to form a [Co(III) (NH3)502 ]2+ complex. The general intermolecular redox process can be approximated by the reactions... 

Of the mononuclear complexes perhaps the most interesting are [IrCls]3 and the complex cobalt hydrides since in both cases cyclic reactions have been observed. For [IrCl6]3-, hydrogen and chlorine are formed on irradiation with 254 nm light, apparently by processes involving free radicals (equations 8-15).70 The photochemical excitation probably involves L-M charge transfer. 

Reaction of Cytochrome cimu with Tris(oxalato)cobalt(III) The cytochrome c protein was also used as reductant in a study of the redox reaction with tris (oxalato)cobalt(III).284 Selection of the anionic cobalt(III) species, [Conl(ox)3]3 was prompted, in part, because it was surmised that it would form a sufficiently stable precursor complex with the positively charged cyt c so that the equilibrium constant for precursor complex formation (K) would be of a magnitude that would permit it to be separated in the kinetic analysis of an intermolecular electron transfer process from the actual electron transfer kinetic step (kET).2S5 The reaction scheme for oxidation of cyt c11 may be outlined ... 

Similar studies using differently functionalized pyrene and iron or cobalt porphyrins were proposed to obtain integrated SWCNT nanohybrids [128] and, very interestingly, the use of multi-walled CNTs (MWCNTs) produced remarkable results as well [129, 130]. Complexes of MWCNTs and pyrene were obtained and combined with metallo-porphyrins, giving rise to charge separated species upon photoexcitation. MWCNTs are easier to process and their electrOTiic structure is more suitable to achieve charge transfer and transport due to the presence of concentric internal graphitic layers. 

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