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Chapter 26: Problem 15

Writes short notes on (a) Nephelauxetic series (b) Magnetic susceptibility

Short Answer

Expert verified
Nephelauxetic series refers to transitions undergone by metal ions related to the nephelauxetic effect, which explains shifting of absorption spectra towards longer wavelength in transition metal ions complexes. Magnetic susceptibility indicates the degree of magnetization a material shows in response to a magnetic field, classifying substances into diamagnetic, paramagnetic or ferromagnetic.

Step by step solution

01

Explain the Nephelauxetic Series

Nephelauxetic series refers to the series of the transitions undergone by metal ions (generally the transition metal ions). It is associated closely with the 'nephelauxetic effect', which is a theoretical concept proposing that the electrons in the d-orbital of transition metal ions are not as localised in certain complexes (especially in the presence of strong field ligands) as they are free ions. This results in a relative expansion of the electron cloud, with a subsequent decrease in the effective nuclear charge experienced by the outer shell electrons. It explains the reason behind the shifting of absorption spectra towards lower energy (or longer wavelength) than predicted by crystal field theory.
02

Explain Magnetic Susceptibility

Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field. It indicates whether a substance is attracted into or repelled out of a magnetic field. Substances can be classified into diamagnetic (negative susceptibility), paramagnetic (positive susceptibility) and ferromagnetic (very large positive susceptibility) depending on their behaviour in the magnetic field.

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