JEE Main · 2019 · 08 Apr 2019 · Shift 1 · Coordination Compounds

The following ligand is:

(A)tridentate
(B)bidentate
(C)tetradentate✓ Correct
(D)hexadentate

Answer: (C)

Solution

The molecule is an amino-bis(phenol) type ligand. A central tertiary nitrogen carries three arms: two ortho-hydroxybenzyl groups and one

- C H_{2} C H_{2} - N E t_{2}

arm. On coordination the two phenolic

- O H

groups lose their protons and bind as phenoxide oxygens, while both nitrogen atoms donate their lone pairs, the central amine nitrogen and the terminal

- N E t_{2}

nitrogen. That gives four separate donor atoms wrapping a single metal centre, two

N

and two

O

, so the ligand is tetradentate.

JEE Main · 2019 · 08 Apr 2019 · Shift 1 · Single correct option

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