When Cd2+ is adsorbing on Fe12O12 nanocage, a strong interaction occurs between Cd and Fe, instead of an Cd-O interaction. What may be the reason?

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There is a bond path shown between Cd and Fe in QTAIM analysis.

The tendency of a soft acid like Cd+2 forming strong interaction with Fe in Fe12O12 nanocage is the result of a combination as stated below.

1. as per hard and soft acid base theory and

2. Smaller electronegative difference and orbital overlap between Cd and Fe leads to more covalent interactions.

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