Rainbowpink1999x
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Hi is anyone able to help me answer the following questions please I'm just a little bit stuck haha;
c) Explain what happens to the energies of the 3d orbitals when the ion is approached by water molecules to form the [Ti(H2O)6]3+ complex ion
d) Explain why this results in the violet colour of the [Ti(H2O)6]3+ complex ion.
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charco
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(Original post by Rainbowpink1999x)
Hi is anyone able to help me answer the following questions please I'm just a little bit stuck haha;
c) Explain what happens to the energies of the 3d orbitals when the ion is approached by water molecules to form the [Ti(H2O)6]3+ complex ion
d) Explain why this results in the violet colour of the [Ti(H2O)6]3+ complex ion.
There is electrostatic repulsion between the approaching ligands in the 4th shell and the orbitals in the 3d (inner) shell. This causes the 3d orbitals to split into two groups (eg and t2g).

The titanium(III) ion has a configuration of 3d1. Once the 3d orbitals are split, the 3d1 electron can be promoted from the lower to the upper energy orbitals, absorbing light of a visible wavelength. The remaining part of the white light spectrum (that is not absorbed) is observed (the complementary colour), in this case violet.
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Rainbowpink1999x
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(Original post by charco)
There is electrostatic repulsion between the approaching ligands in the 4th shell and the orbitals in the 3d (inner) shell. This causes the 3d orbitals to split into two groups (eg and t2g).

The titanium(III) ion has a configuration of 3d1. Once the 3d orbitals are split, the 3d1 electron can be promoted from the lower to the upper energy orbitals, absorbing light of a visible wavelength. The remaining part of the white light spectrum (that is not absorbed) is observed (the complementary colour), in this case violet.
Perfect! Thank you that’s helped a lot
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