Question:
The correct option(s) regarding the complex ${[Co(en)(NH3)3(H2O)]^{3+} (en = H2NCH2CH2NH2)}$ is (are)
The correct option(s) regarding the complex ${[Co(en)(NH3)3(H2O)]^{3+} (en = H2NCH2CH2NH2)}$ is (are)
Updated On: Jun 14, 2022
- It has two geometrical isomers
- It will have three geometrical isomers if bidentate ?en? is replaced by two cyanide ligands
- It is paramagnetic
- It absorbs light at longer wavelength as compared to ${[Co(en)(NH3)4]^{3+}}$
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The Correct Option is D
Solution and Explanation
(A) ${[Co(en)(NH_3)_3 (H_2O)]^{+3}}$ complex is type of ${[M(AA)b_3 c ]} $ have two G.I.
(B) If (en) is replaced by two cynide ligand, complex will be type of ${ [Ma3b2c]}$ and have 3 G.I.
(C) ${[Co(en)(NH3)3(H2O)]^{3+}}$ have d6 configuration ${(t^6_{2g})}$ on central metal with SFL therefore it is dimagnetic
in nature.
(D) Complex ${ [Co(en)(NH3)3(H2O)]^{3+}}$ have lesser ${CFSE (\Delta_O)}$ value than ${[Co(en)(NH3)4]^{3+}}$ therefore complex ${ [Co(en)(NH3)3(H2O)]^{+}}$ absorbs longer wavelength for d-d transition.
(B) If (en) is replaced by two cynide ligand, complex will be type of ${ [Ma3b2c]}$ and have 3 G.I.
(C) ${[Co(en)(NH3)3(H2O)]^{3+}}$ have d6 configuration ${(t^6_{2g})}$ on central metal with SFL therefore it is dimagnetic
in nature.
(D) Complex ${ [Co(en)(NH3)3(H2O)]^{3+}}$ have lesser ${CFSE (\Delta_O)}$ value than ${[Co(en)(NH3)4]^{3+}}$ therefore complex ${ [Co(en)(NH3)3(H2O)]^{+}}$ absorbs longer wavelength for d-d transition.
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.