Question

When Cr2+ is linked with a strong–field ligand to produce an octahedral complex, the ion has two unpaired electrons. When it is linked with a weak–field ligand, the ion has four unpaired electrons. In contrast, the complex resulting from Cr3+ always has three unpaired electrons regardless of the nature of the ligand. Explain.

Answer 1

Answer on Question #56732 - Chemistry - Inorganic Chemistry

Question:

When Cr2+ is linked with a strong–field ligand to produce an octahedral complex, the ion has two unpaired electrons. When it is linked with a weak–field ligand, the ion has four unpaired electrons. In contrast, the complex resulting from Cr3+ always has three unpaired electrons regardless of the nature of the ligand. Explain.

Answer:

Let’s take a look at electronic configurations of these ions in different fields:

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