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They are compounds that contain a coordination complex, which is the product of a Lewis acid-base reaction where neutral molecules/anions (ligands) bond to a central metal atom/ion by coordinate covalent bonds (bonds formed when one donor atom supplies both electrons).
It is a covalent bond formed between two molecules. However the 2 electrons in the covalent bond come from the same atom. Typically, a covalent bond is formed between two atoms using one electron from each. However a coordinate covalent bond shows that you can create a covalent bond between two atoms with electrons from only one atom. For example, when NH3 interacts with BF3, the lone pair on N is used to fill the electron deficiency BF3 has (it only has 6 of its valence electrons filled). Once this coordinate covalent bond is formed, B's octet is filled and the molecule is stable.
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