Electron-transfer-chain ETC Catalysis

Electrocatalysis, also named Electron-Transfer-Chain (ETC) catalysis, whereby a reaction (mostly of non-redox type) is catalyzed by an electron (reduction) or by an electron hole (oxidation). Organotransition-metal complexes can carry an electron or an electron hole and, if they achieve this function without decomposition, they are electron-reservoir complexes [6],... 

Here, we have only emphasized types of dendrimer catalysis involving electron transfer (redox catalysis and electron transfer chain (ETC) catalysis). Other types of dendrimer catalysis are reviewed elsewhere.6,7... 

The electron-transfer chain (ETC) catalytic process (or, electrocatalysis) is the catalysis of a reaction triggered by electrons (through a minimal quantity of an oxidizing or reducing agent) without the occurrence of an overall change in the oxidation state of the reagent. 

All these mechanisms are non-redox in nature, as is easily found by consideration of the oxidation states of the carbon centers involved. They are furthermore chain reactions, initiated by electron transfer, and the term electron-transfer chain catalysis (ETC catalysis) is therefore appropriate (Alder, 1980). Another term is the DAISET (Double Activation Induced by Single Electron Transfer) concept, recently introduced by Chanon and Tobe (1981). The DAISET (ETC) concept is applicable to inorganic mechanisms too. 

The mixed-ligand complexes [M(CO)x(PR3)7] with M = Cr, Mn, Mo, W were prepared by CO or ligand substitution by electron transfer chain catalysis (ETC catalysis),47- 9 such as ... 

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