Question about Chromium, Oxidation states and colored solutions?

[匿名]

2016-05-04 5:07 pm

QUESTION: Chromium can exist in various oxidation states including +2, +3 and +6. Each of these oxidation states would lead to a different colored solution. Explain why transition metal complex ions give rise to colored solutions?

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回答 (1)

fooks

2016-05-04 5:53 pm

✔ 最佳答案

In the solutions of chromium compounds, the chromium ion is surrounded by ligands (such as H₂O). The repulsions between electrons of ligands and those in different d-orbitals of the chromium ion are not the same. Therefore, the d-subshell of the chromium ion would have two energy levels with a fairly small energy difference. Visible light is absorbed when d-electrons are promoted to a higher energy level within the d-subshell. The solution becomes coloured when visible light of a certain wavelength is absorbed.

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