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प्रश्न
Explain the violet colour of the complex [Ti(H2O)6]3+ on the basis of crystal field theory.
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उत्तर
- The electronic configuration of Ti3+ is [Ar] 3d1.
- The presence of ligands causes the five d-orbitals to be divided into two sets: three orbitals with lower energy and two orbitals with higher energy.
- So, there occur d-d transitions between these two sets of orbitals. In the ground state, the only d-electron occupies one of the three lower-energy d-orbitals.
- Upon absorbing light energy in the visible spectrum, this d-electron is promoted to a higher-energy d-orbital. It absorbs light in the green and yellow parts of the visible spectrum, resulting in transmitted light that is red and violet (purple).
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