Hybridisation and the magnetic properties of the complex, Chemistry

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Q. Hybridisation and the magnetic properties of the complex?

Pauling showed that there is a direct correlation between the type of hybridisation and the magnetic properties of the complex. In order to understand this relationship, you should recapitulate the basic concepts of magnetism. The orbital motion and the spinning of the electron give rise to a certain angular momentum to an atom. This angular momentum causes the atom to acquire magnetic moment. The magnetic moment due to spin angular momentum is much greater in comparison to magnetic moment arising out of orbital angular momentum. Further, if there are two electrons in an orbital having opposite spins, the magnetic moment due to spin angular momentum will be zero. However, if there are unpaired electrons in an atom its magnetic moment is given by the expression:

395_Hybridisation and the magnetic properties of the complex.png

μ= GBM where n is the number of unpaired electrons and BBM is the unit of magnetic moment. It is called Bohr Magnetic and abbreviated as BM The formula is known as spin-only formula for the calculation of magnetic moment since in its derivation we have omitted the contribution due to orbital angular momentum.

Placed irk ail external magnetic field are pulled towards the field. Table 14.4 gives the number of unpaired electrons and the associated magnetic moment.


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