The order of energy absorbed which is responsible for the color of complexes
- Ni(H2O)2(en)2]2+
- [Ni(H2O)4(en)]2+
- [Ni(en)3]2+
The order of energy absorbed which is responsible for the color of complexes
- Ni(H2O)2(en)2]2+
- [Ni(H2O)4(en)]2+
- [Ni(en)3]2+
- A > B > C
- C > B > A
- C > A > B
- B > A > C
The Correct Option is C
Solution and Explanation
To determine the order of energy absorbed responsible for the color of the complexes, we need to consider the ligand field strength and the number of ligand substitutions around the central metal ion (in this case, Ni2+).
Ligand field strength affects the splitting of the d-orbitals. Stronger field ligands cause greater splitting, requiring more energy for electronic transitions, which affects complex color absorption.
We consider the given complexes:
- [Ni(H2O)2(en)2]2+ (A)
- [Ni(H2O)4(en)]2+ (B)
- [Ni(en)3]2+ (C)
Analysis:
- Ethylene diamine (en) is a stronger field ligand than water (H2O). Therefore, complexes with more 'en' ligands will have greater d-orbital splitting.
- Complex C, [Ni(en)3]2+, has three 'en' ligands, exerting the strongest field and causing the highest d-orbital splitting.
- Complex A, [Ni(H2O)2(en)2]2+, with two 'en' ligands, has intermediate splitting.
- Complex B, [Ni(H2O)4(en)]2+, with one 'en' ligand, has the least splitting.
Conclusion: The order of energy absorbed (and thus d-orbital splitting) is C > A > B.
Correct answer: C > A > B
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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.