Question

What is flexidentate ligand

Answer 1

Flexidentade ligands are polydentate ligands that do not use all its donor atoms to bind to the metal ion. ... For example, EDTA can either use all 6 donor atoms to show hexadentate coordination or act as a pentadentate or tetradentate ligand depending upon the size and stereochemistry of chelate formed

Answer 2

Answer :

Flexidentate ligands : There are many ligands which have more than one donor atoms (polydentate ligands).

The examples of such ligands are $SO_4^{2-}$ (both negatively-charged O-atoms are donor atoms), $CO_3^{2-}$ (both negatively-charged O-atoms are donor atoms), $N_2$ (both N-atoms are donor atoms).

All these ligands have two donor atoms. When these ligands get coordinated to the metal atom or ion, they give rise to the formation of two types of complex compounds. In one type they get linked to the metal atom through one donor atom only while in the formation of another type of the complex compound, they get coordinated to the metal atom through both of its donor atoms.