Problem: Classify the following complex ions as high spin or low spin:1) [ Fe (CN)6 ] 4- no unpaired e-2) [ Fe (CN)6 ] 4- one unpaired e-3) [ Co (NH3) 6 ] 2+ three unpaired e-'s4) [ Co F6 ] 3- four unpaired e-'s5) [ Mn (H2O) 6 ] 2+ five unpaired e-'s

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To classify the following complex ions as high spin or low spin:

  • weak field ligands → high spin  low Δ or crystal field splitting energy values 
  • strong field ligands → low spin  high Δ or crystal field splitting energy values
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Problem Details

Classify the following complex ions as high spin or low spin:

1) [ Fe (CN)6 ] 4- no unpaired e-

2) [ Fe (CN)6 ] 4- one unpaired e-

3) [ Co (NH3) 6 ] 2+ three unpaired e-'s

4) [ Co F6 ] 3- four unpaired e-'s

5) [ Mn (H2O) 6 ] 2+ five unpaired e-'s

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Crystal Field Theory concept. If you need more Crystal Field Theory practice, you can also practice Crystal Field Theory practice problems.

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Based on our data, we think this problem is relevant for Professor Paul's class at PITT.