Abstract
The chapter endeavours to explain the basic concepts of coordination chemistry to nonchemists. The different types of chemical bonds are introduced, notably the coordinate bonds found in coordination compounds. Biologically important metal ions and their ligands are classified according to the ‘hard–soft acid–base’ concept, followed by a description of the enhanced stability metal complexes due to the ‘chelate effect’ of both natural chelators and metal-binding proteins. This leads to a discussion of the geometry of coordination compounds, and the effect of the ligand donor atom and the stereochemistry at the metal ion on the redox potential of transition metal ions. An overview of crystal field, ligand field and molecular orbital theories concludes the chapter, leading to the essential take-home message that the metal ion has its properties influenced by its ligands and vice versa.
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