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Crystal Field Theory (Octahedral Geometry) - Coordination Chemistry Video Lecture | Inorganic Chemistry

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FAQs on Crystal Field Theory (Octahedral Geometry) - Coordination Chemistry Video Lecture - Inorganic Chemistry

1. What is crystal field theory in coordination chemistry?
Ans. Crystal field theory is a model used in coordination chemistry to explain the bonding and properties of transition metal complexes. It focuses on the interaction between the metal ion and the ligands surrounding it, specifically in terms of the electrostatic field created by the ligands. This theory helps explain the colors, magnetic properties, and stability of transition metal complexes.
2. What is octahedral geometry in crystal field theory?
Ans. Octahedral geometry refers to the arrangement of ligands around a central metal ion in a coordination complex. In crystal field theory, an octahedral complex consists of six ligands positioned at the vertices of an octahedron. The ligands can be either negatively charged (anionic ligands) or neutral molecules (neutral ligands). This geometry is commonly observed for transition metal complexes with a coordination number of six.
3. How does crystal field theory explain the color of transition metal complexes?
Ans. Crystal field theory explains the color of transition metal complexes by considering the absorption of light. The d-orbitals of the central metal ion split into two sets of energy levels in the presence of ligands. When light passes through the complex, electrons in the lower energy level (t2g) absorb photons of specific energy, corresponding to certain colors, causing an electronic transition to the higher energy level (eg). The complementary color is observed as the absorbed color is subtracted from the white light, resulting in the observed color of the complex.
4. What is the significance of the crystal field splitting parameter (Δ) in crystal field theory?
Ans. The crystal field splitting parameter (Δ) is a measure of the energy difference between the t2g and eg sets of d-orbitals in a coordination complex. It quantifies the extent of ligand-field splitting and determines various properties of the complex, such as its color, magnetic behavior, and stability. A larger value of Δ corresponds to a greater energy difference between the two sets of orbitals, resulting in a higher energy required for electronic transitions and a greater color intensity.
5. How does crystal field theory explain the magnetic properties of transition metal complexes?
Ans. Crystal field theory explains the magnetic properties of transition metal complexes by considering the arrangement of electrons in the d-orbitals. In an octahedral complex, if all the d-orbitals are fully occupied or completely empty, the complex is diamagnetic, meaning it does not have any unpaired electrons and is not attracted to a magnetic field. However, if there are unpaired electrons in the d-orbitals, the complex is paramagnetic and can be attracted to a magnetic field. The number of unpaired electrons determines the magnetic behavior of the complex.
40 videos|91 docs|41 tests
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