Abstract
This chapter deals with “clusters”, which was famously phrased by a prominent organometallic chemist F. Albert Cotton. A cluster is usually a group of two or more metal atoms where direct and substantial metal bonding is present. They have attracted immense interest among chemists and biologists because of their important role in material and biological functions. A few well-known examples of clusters include iron-sulfur clusters as electron carriers, boron clusters for organic transformations, and zeolites for water purification. Because of their many important applications it is necessary to have knowledge and an understanding of these clusters. Another imperative subject that this section deals with is “isolobal fragments”. These consider the structures of inorganic and organic molecular fragments to predict the bonding properties of organometallic compounds. For further knowledge of chemistry, one must have the basic understanding of these topics.
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