What are low spin and high spin complexes with examples?
The usual Hund’s rule and Aufbau Principle apply. Examples of low-spin d6 complexes are [Cr(CN)6]3− and Cr(CO)6 , and examples of high-spin d6 complexes are [CrCl6]3− and Cr(H2O)6 .
Which is high spin complex example?
Example: [Fe(CN)6]3−. Octahedral high-spin: 4 unpaired electrons, paramagnetic, substitutionally labile. Includes Fe2+, Co3+.
Which complex is more stable high spin or low spin?
All Answers (6) High Spin complexes are mostly stable compare to the low spin complex to avoid the pairing energy that is needed to form low spin unless the CFSE is very high in low spin situation. In these complexes the overall stability is gained from the bond energy.
Which is high spin complexes?
A high spin complex is a complex that has a significant number of unpaired electrons present in its d-orbital. So, the electrons will fill all the orbitals first before pairing up the electrons. This will result in a large number of unpaired electrons and will cause the complex to have a high spin.
How do you know if a complex is high spin or low spin?
Another method to determine the spin of a complex is to look at its field strength and the wavelength of color it absorbs. If the field is strong, it will have few unpaired electrons and thus low spin. If the field is weak, it will have more unpaired electrons and thus high spin.
How do you get a high spin complex?
Which of the following is a high spin spin Free complex?
Usually outer orbital complexes (sp3d26) are high spin (or spin-free) complexes.
Why are low spin tetrahedral transition metal complexes rare?
In a tetrahedral complex, Δt is relatively small even with strong-field ligands as there are fewer ligands to bond with. It is rare for the Δt of tetrahedral complexes to exceed the pairing energy. Usually, electrons will move up to the higher energy orbitals rather than pair.
Why tetrahedral complexes are always high spin complexes?
Now in a tetrahedral complex, there is less number of ligands and the contribution to orbital splitting is very low, there causing a very low orbital splitting energy. In this case the orbital splitting energy is always lower than pairing energy, leading to high spin always.
Is fef6 3 high spin complex?
The outer electronic configuration of Fe3+ ion is 3d5 which is highly stable and no pairing of electrons takes place in presence of weak field of F– ions. Here, 4d–orbitals of Fe3+ (which are empty) are involved. The entity is strongly paramagnetic due to five unpaired electrons and is an outer orbital complex.
Which is a high spin or low spin complex?
These are called spin states of complexes. We can determine these states using crystal field theory and ligand field theory. Generally, octahedral complexes and tetrahedral complexes are high spin, while square planar complexes are low spin. 1. Overview and Key Difference
Why are octahedral complexes called low spin complexes?
Octahedral complexes. Complexes such as this are called “low-spin” since filling an orbital matches electrons and reduces the total electron spin. If the separation between the orbitals is small enough then it is easier to put electrons into the higher energy orbitals than it is to put two into the same low-energy orbital,…
What are high and low spin complexes in crystal field theory?
Examples of low-spin d6 complexes are [Cr(CN)6]3− and Cr(CO)6, and examples of high-spin d6 complexes are [CrCl6]3− and Cr(H2O)6. I assume you know the basic facets of crystal field theory:
Where does the classification of spin complexes come from?
These classifications come from either the ligand field theory, which accounts for the energy differences between the orbitals for each respective geometry, or the crystal field theory, which accounts for the breaking of degenerate orbital states, compared to the pairing energy.