Ligands - Definition | 食品添加物合法業者資訊網

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A ligand is an ion or molecule which donates a pair of electrons to the central metal atom or ion to form a coordination complex. The word ligand is from Latin, which means “tie or bind”. Ligands can be anions, cations, and neutral molecules. Ligands act as Lewis bases (donate electron pairs), and central metal atoms are viewed as Lewis acids (electron pair acceptors). The nature of bonding from metal to ligand varies from covalent bond to ionic bond.

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Occasionally ligands can be cations (NO+, N2H5+) and electron-pair acceptors. Examples for anionic ligands are F–, Cl–, Br–, I–, S2–, CN–, NCS–, OH–, NH2– and neutral ligands are NH3, H2O, NO, CO.

A ligand is an ion or molecule which binds to the central metal atom to form a coordination entity or complex compounds. Classification of ligands is on the basis of the number of bi...