Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Experiments show that K4[Cr(CN)6] is paramagnetic and has two unpaired electrons. The related complex K4[Cr(SCN)6] is paramagnetic and has four unpaired electrons. Account for the magnetism of each compound using the ligand field model. Predict where the SCN ion occurs in the spectro-chemical series relative to CN.

Interpretation Introduction

Interpretation: The effect of ligands on the magnitude of Δ0 has to be predicted.

Concept introduction:

Spectrochemical series:  A list of ligands ordered in the basis of ligand strength.

I-<Br-<Cl-<F-< OH-< H2O < NH3< en <CN-<CO

Paramagnetic property: The presence of unpaired electrons in the electronic configuration of the metal ion in coordination complex.

Diamagnetic property: The absence of unpaired electrons of the metal ion in coordination compound which do repel by the magnet.


The complex ion K4[Cr(CN)6], the cyanide ion acts as strong field ligand which results in low-spin complex. Hence, the presence of unpaired electrons does attract the magnets that confirm the complex is paramagnetic

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