Why can't there be a metal-metal multiple bond in ?

The presence of the bridging oxygen atom also contributes to the formation of a double bond between the Re and oxygen atoms. Therefore, there can only be metal-ligand and metal-metal single bonds in this molecule, not multiple bonds.
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Why can't there be a metal-metal multiple bond in ... ?

[Re2OCl10] 4-

Each Re has an octahedral geometry basically, with 5 Cl- attached to it. It also has a bridging O, which bridges the two Re together.

O also produces pi donation to each Re, so that there is basically a double bond between Re-O

But still... which can't there be a bond between the Re? there are unpaired electrons which can be paired by making this bond! Can there be metal-ligand and metal-metal multiple bonding in the same molecule?

thank you!
 
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  • #2
No, there cannot be a metal-metal multiple bond in Re2OCl10 because the Re atoms are already bonded to the oxygen atom through a single bond. The electrons in the outermost shells of the Re atoms are already paired and engaged in other bonds, leaving no unpaired electrons available for a metal-metal multiple bond.
 

What is a metal-metal multiple bond?

A metal-metal multiple bond is a type of chemical bond between two metal atoms, where there is sharing of electrons between the two atoms. This results in the formation of a double or triple bond between the metals, similar to the bonds found in molecules such as carbon dioxide or ethene.

Why is it difficult for metals to form multiple bonds with each other?

Metals have a high tendency to lose electrons and form positively charged ions. This makes it difficult for them to share electrons and form multiple bonds with each other. Additionally, the atomic orbitals of metals are often too diffuse to effectively overlap and form strong bonds.

Can any metal-metal multiple bond exist?

Yes, some metal-metal multiple bonds have been observed in certain compounds, but they are usually unstable and tend to break down easily. These bonds require very specific conditions and are not as common as other types of chemical bonds.

Why are metal-metal multiple bonds important in chemistry?

Metal-metal multiple bonds play a crucial role in various chemical reactions, such as catalysis and organic synthesis. They also have unique electronic and magnetic properties that make them useful in materials science and technology.

Are there any exceptions to the general rule that metals cannot form multiple bonds with each other?

Yes, there are some exceptions to this rule. Some transition metals, such as chromium and molybdenum, are able to form stable multiple bonds with each other due to their particular electronic configurations and bonding abilities. However, these cases are still rare compared to other types of chemical bonds.

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