How are the 10 vertical bonds in Ferrocene (sandwich structure) connected, by what type of bonds?
What is the real structure of ferrocene? Concerning the 10 vertical extra long bonds?
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The "real" structure of ferrocene is an iron atom sandwiched between to flat, parallel, pentagonal C5H5 rings. The diagram above shows the atomic positions from a crystal structure but the bonds are merely a convenience and don't accurately summarise the way the bonding works though the picture does accurately summarise the atomic positions in the crystal structure.
The real bonding requires some understanding of molecular orbital theory and how the d-orbitals of iron interact with the delocalised pi-orbitals in the unsaturated ring. Some pictures of the orbitals contributing to the bonding are shown here.