Magnetic Properties of Transition Elements in Coordination Chemistry

Magnetic behaviour can be seen in a variety of substances. We have paramagnetic compounds, which are attracted to the magnetic field. Paramagnetism is the name for this phenomenon. When a substance has one or more unpaired electrons, it has a paramagnetic property. A substance becomes ferromagnetic when it gains a permanent magnetic moment, and the phenomenon is known as ferromagnetism. On the other hand, we have diamagnetic compounds, which are chemicals that are repelled by a magnetic field. When a substance includes exclusively paired electrons, it exhibits diamagnetism.

The majority of transition elements are paramagnetic. The magnetic characteristics are caused by unpaired electrons in (n-1) d orbitals. As the number of unpaired electrons grows from one to five, the paramagnetic property of transition metals increases from left to right. The maximum paramagnetic property is seen in the intermediate elements. As the number of unpaired electrons decreases, so do the magnetic characteristics. Diamagnetic behaviour is seen in transition metals with paired electrons.

Determining the metal and non-metal can be based on this fact which element has a positive and negative ion. The negative ion element comes in the series of metal and positive ions belong to the metal category. To read out the physical and chemical properties of an element, they are arranged in a periodic table in form and column format. The transition elements are those elements which do not comprise the full electronic configuration in the oxidation stage. Generally, it belongs to d-block elements.

Magnetic properties

An electron is a negatively charged particle that spins on its own axis and circulates around the nucleus. The orbital motion and spin of the electron produce a magnetic field. The flow of electric current in a closed circuit is quite similar to the spinning of an electron in an orbit. As a result, an unpaired electron is thought to be a tiny magnet with a distinct magnetic moment. When a substance having an unpaired electron is placed in a magnetic field, the unpaired electron interacts with the applied field. As a result, an attractive force is exerted, revealing the paramagnetic feature. The magnitude of the magnetic moment is determined by the number of unpaired electrons. The magnetic moment and paramagnetic behaviour of a substance increase as the number of unpaired electrons increases.

When it comes to paired electrons, each pair's electrons will have the opposite spin. In nature, the magnetic field formed by electrons of the same pair is equal and opposing. As a result, the magnetic field formed by one electron is cancelled by the magnetic field induced by the other. As a result, the magnetic moment has no net effect. These materials have diamagnetic properties and are repelled by the applied magnetic field.

The d-block element in the periodic table will show the magnetic property as their (n-1) d orbital owns the unpaired electrons. The higher the number of the unpaired electron in (n-1) element electronic configuration, they will tend to achieve the maximum magnetic behaviour. It is generally observed that the transition element ion; will exhibit paramagnetic behaviour. It can be easily attracted by the magnetic field.

Trends of The Transition Element

• As the number of unpaired electrons increases from 1 to 5, the magnetic moments increase. As a result, they will reach on the verge of the increased paramagnetic and decreased diamagnetic

• Some transition elements have the paired electrons in (n-1) d orbital. It does not attract a magnetic field. These paired electrons are known as the diamagnetic.

• Some metals have high paramagnetic i.e. it contains permanent paramagnetic. Hence, these transition elements are termed as ferromagnetism. The best example of ferromagnetism is Co and Ni.   

Magnetic Properties Of Transition Metal Complexes

Prediction of magnetic property is not easy unless there is a sure confirmation to how many unpaired electrons in the outermost cells. Electronic configuration and atom size play an important role. The magnetism of any compound has been achieved by electronic spin, the number of an unpaired electron to measure out how magnetised the compound is. 

The interesting fact of this compound is to yield the magnets. Metal complexes have unpaired electrons and thus, adopt the magnetic behaviour. The spin of each electron is represented by the quantum number Ms as +1/2 and -1/2. The spin has a flat effect as the electrons are coupled to each other. In case these electrons get single, it creates a weak magnetic field. The availability of a single electron will increase the paramagnetic effect.

Transition Elements Magnetic Properties

Achievement of the magnetic property takes place as the direction of the quantum number is in the opposite direction. Let us learn the characteristics of the transition element.

• These elements contain high melting and boiling points.

• These elements have different valance in their outermost shell. Thereby, it has different oxidation stages.

• It forms the coloured compound and chemical inorganic complex due to the existence of colour ions.

• These elements have paramagnetic behaviour rather than diamagnetic behaviour.

The most common examples of the transition elements are copper, iron, and silver. This is the abundant transition element.  

Magnetic Properties Of The First Transition Series

The position of the first transition series lies amid the fourth, fifth, sixth, and seventh groups. It consists of a coloured compound effect due to internal d-d transfers. The magnetic properties can conclude with theories such as Lenz’s, curie, and quantum mechanics.  

Explain The Magnetic Properties of Transition Elements

Without any clue and facts, it is hard to explain whether a particular element and compound are paramagnetic or not. So, there sure is a need to make the electronic configuration and see if the configuration leads to paired and unpaired electrons. In case it holds the unpaired electrons in (n-1)d shells, then it has the paramagnetic and ferromagnetic behaviour. Take the element of transition elements e.g. Zinc (Zn) to determine if it is magnetic or not.

Steps for Determining Magnetic Properties

1. The electronic configuration of Zn atom is 4s2 3 d 10

2. Sketch of the valence orbital – Image will be uploaded soon

3. There is no unpaired electron.

4. Due to the unavailability of unpaired electrons, it does not exhibit paramagnetic behaviour.

Conclusion:

This article talks about the electrical configurations of transition elements and how they differ from that of other transition metals like, zinc, cadmium, and mercury, which are not considered transition elements. The properties of the rest of the d-block elements, on the other hand, are very similar, and this likeness can be seen down each row of the periodic table.