Chalcogen cluster complex

Application to the Controlled Synthesis of Chalcogen-Metal Complexes and Clusters... 

Molybdenum coordination has recently been comprehensively reviewed in Comprehensive Coordination Chemistry, particularly in the areas of mononuclear complexes, polyoxometaUate synthesis, structure, and reactivity see also Polyoxometalates), and in chalcogen-containing cluster complexes. ... 

Within this context, the present article concentrates on transition metal cluster complexes of cobalt, iron and manganese with mixed chalcogen/carbonyl ligand spheres obtained by reaction of simple binary metal carbonyls with alkali-metal sulfides, alkali-metal thiolates or transition-metal thiolate complexes and their selenium or tellurium counterparts. 

In the following sections, we will discuss the results of our recent work in the field of manganese-, iron- and cobalt cluster complexes with mixed chalcogen/carbonyl ligand spheres, taking relevant complexes from the literature into account. 

A pentanuclear mixed chalcogen/carbonyl cluster complex with ethanethiolate ligands is the cobalt-containing species [Co5(SEt)5(CO)io], which was structurally characterized by X-ray methods (Fig. 22). 

A hexanuclear chalcogen/carbonyl compound of cobalt containing no thiolate ligands, [Co6E2(E2)(CO)i4] (E = S, Se), is shown in Fig. 27 for E = The cluster complex is assembled from two identical trinuclear Co3S(CO)vS2 sub-units which share the S atoms of the disulfide ligand. They possess principle features already known from the [Fe3E(CO)9]- (E = S, Se, Te) series of complexes (see Fig. 9, Section 1.10.5). 

Compared with cluster complexes of lower nuclearities, the number of mixed chalcogen/carbonyl complexes having more than six metal atoms is small. Besides some complexes containing iron and cobalt, no manganese compound within this class of complexes is known. 

B7.3 Some synthetic and theoretical aspects of the chemistry of polynuclear transition metal complexes [chalcogen clusters]... 

The first structurally characterized lanthanide chalcogen clusters were isolated as decomposition products of monomeric or dimeric species. Trivalent tellurolate complexes Ln[TeSi(TMS)3]3 (Ln = Ce, La), which can only be isolated as dmpe derivatives, decompose in solution to yield... 

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