Chalcogenide ligands

Figure 1.41 Polynuclear gold(I) complexes with bridging chalcogenide ligands.

Preferential substitution of a face-capping chloride ligand over a facecapping chalcogenide ligand can also be accomplished. Reactions between the... 

From the synthetic and crystallographic studies of W/Se chemistry (91) it has been revealed that certain aspects of this chemistry do not parallel those of W/S chemistry. This is particularly true for the degree of catenation found with the E chalcogenide ligands. Thus the Sei ligand found in the [(Se3)(Se)W(/i-Se)]2 and [(SesXSelW (/i-Se)2W(Se)(Se2)] complexes (91) has no counterpart in Mo/S or W/ S chemistry. As a general rule, selenide chemistry appears more complex and the compounds are less stable. 

The above examples notwithstanding, chalcogenide ligands predominantly form bridging interactions with metal centers. As a result, binary metal chalcogenides are typically nomnol-ecular solids, with extensive bonding in one, two, or three dimensions. The synthesis of metal... 

Figure 6 Common bridging modes of chalcogenide ligands.

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