coordinate bond

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co·or·di·nate bond

(kō-ôr′dn-ĭt, -āt′)
A covalent chemical bond between two atoms that is produced when one atom shares a pair of electrons with another atom lacking such a pair. Also called semipolar bond.
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Ligands in general may attach to the metals with coordinate bonds involving the lone pair of electrons in: 0,: N, or: [Cl.
The directionality of the coordinate bonds is an important feature in the structure of hemes, cobalamins, chlorophylls, and related structures.