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2023sponding tzg orbitals on each metal atom, then, gives three Fe-Fe bonds, one Q and two T .Concerning the evaluation of the Fe-Fe bond order in this compound, we are in agreement with Cotton' that any attempt to find a direct correlation of the metal-metal distance with bond order in this type of structures is meaningless. Therefore, it does not seem unreasonable to affirm that in the [FezH3(P3)z]+ complex cation there are three Fe-Fe interactions, some or all of which are weaker than a full bonding interaction.

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