SME
Inorganic Chemistry · Problem type
How strong is the band?
Use this for “Why is [Mn(H₂O)₆]²⁺ so pale while MnO₄⁻ is intensely purple? Which has the larger ε?”
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How strong is the band that colors it?
Tap a card, then tap its group.
Ask which rules the band breaks: spin and Laporte both, Laporte only, Laporte weakly, or neither.
Assumptions
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ε is the molar absorption coefficient at the band’s peak, in L/(mol·cm); each card names the band that colors the ion.
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Spin rule: an allowed band keeps the number of unpaired electrons. Laporte’s rule: a d–d band is forbidden when the ion has a center of symmetry.
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Vibrations and a missing center of symmetry relax the rules; the ranges are typical, not sharp.
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