In the inner boundary, the ions or atoms that can accept lone pair electrons are collectively called central atoms, or central ions, which are located in the center of the coordination individual and are the core part of the coordination individual, also called the formation of complexes.[2]
Judgment of central atom
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Write the structural formula. If the atom connects two or more atoms, it belongs to the central atom. If the atom connects only one atom, it is not the central atom.For example, hydrogen in organic matter is certainly not the central atom, it can only form a bond, always at the end.There may be multiple central atoms in a molecule, such as carbon and oxygen in methanol.[2]
classification
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The central atom of the complex is generally a positively charged cation, in whichTransitional elementMost metal ions, such as
、
Etc;The atoms of a few non-metallic elements with high oxidation value can also be used as central atoms, such as
B (III), etc.And [Ni (Co)four] 、[Fe(Co)five]The central atom in is NiFe atom;[HCo(Co)four]The central atom in is Co (- I).[1]
