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I am performing an experiment for the IB diploma program to determine the crystal field splitting energy of d-orbitals of different transition metal ions when they are complexed with ligands. In my experimental results I discovered that the Crystal field splitting energy for the complex hexaaqua copper (II) is larger than that of the complex hexaqua Iron (II) even though Iron (II) has a smaller ionic radii. I was wondering if anyone could provide me with the correct theory to explain this? Thank you for any help.

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