The reason why Ni(NH 3 ) 4 ] 2+ is paramagnetic, while [Ni(CN) 4 ] 2– is diamagnetic is to be explained. Concept Introduction: The strength of the crystal field can affects the magnetic properties of the complex ions. Strong field ligands produce large amount of crystal field splitting energy, Δ which is less than the pairing energy, thereby pairing of electrons takes place and hence, the complex ion would be diamagnetic. Weak field ligands produce small amount of crystal field splitting energy, Δ which is more than the pairing energy, thereby pairing of electrons does not takes place and hence, the complex ion would be paramagnetic.

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Chapter 25, Problem 72E

Interpretation Introduction

Interpretation: The reason why Ni(NH₃)₄]²⁺ is paramagnetic, while [Ni(CN)₄]^2– is diamagnetic is to be explained.

Concept Introduction: The strength of the crystal field can affects the magnetic properties of the complex ions.

Strong field ligands produce large amount of crystal field splitting energy, Δ which is less than the pairing energy, thereby pairing of electrons takes place and hence, the complex ion would be diamagnetic.

Weak field ligands produce small amount of crystal field splitting energy, Δ which is more than the pairing energy, thereby pairing of electrons does not takes place and hence, the complex ion would be paramagnetic.

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