Condensation Between Coordinately Saturated Species with Different Oxidation States

2 Condensation Between Coordinately Saturated Species with Different Oxidation States 

Redox condensation of an anionic mono or polynuclear carbonyl species with a neutral, cationic, or anionic fragment provides a valuable method for the synthesis of carbonyl metal clusters. 

Among the characteristics of this method are the mild reaction conditions that avoid the degradation of the products and permit the formation of high-nuclearity products. The facility with which such kinds of condensations occur is probably due to the redox character of these reactions. 

Reaction of metallates with neutral metal complexes. The reaction of cluster carbonyl metallates with neutral carbonyl compounds has proved to be very useful in the preparation of homo and heteronuclear derivatives  

As can be seen, the chemical equations indicate that these reactions could often be considered as carbon monoxide displacement reactions. The condensations involving the square-based pyramidal dianion [Fe5C(CO)i4] and some neutral species with labile ligands shown in the scheme in Fig. 2.43 may be cataloged into the same type of reactions. The same is valid in the desplacement of the chlorine atom in the chloromethyl derivative Co3(CO)9CCl by mononuclear and cluster carbonyl metallates according to the following equations. 

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Condensation reactions between coordinately saturated species with different oxidation states, and... 

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