Also called a complex compound, a type of chemical compound in which one or more groups or molecules each form a coordinate bond (two atoms sharing two electrons from one of the atoms), usually a transition element. The complex may be either a complex ion or a neutral molecule, as in nickel carbonyl (Ni(CO)4). The coordinating species are known as ligands. Some coordination compounds, such as heme and chlorophyll, have biological importance. See also chelation; coordination compound.
Related category INORGANIC CHEMISTRY
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