Coordination Covalent Bonds

[Brian_Ho_2B]

I understand that standard covalent bonds between nonmetals are composed of sigma and pi bonds, but how exactly does a covalent bond form between a TM cation and a nonmetal? Does it have something to do with the d-orbitals?

[Ariel Davydov 1C]

The coordinate covalent bond between a nonmetal and a TM metal is "provided" by the nonmetal in the form of an extra lone pair. For example, if we are discussing a coordinate covalent bond between Cl- and Pb2+, the bond between one chlorine atom and one lead atom would be provided by one valence electron lone pair on Cl-, since Pb2+ has no additional electrons to share.

[Tauhid Islam- 1H]

Wait so the bond between the ligand and the TM doesn't form because of the charges from the TM and the ligand? I thought the bond forms because of the net charges, but I don't really know.

[Justin Sarquiz 2F]

When talking about coordinate covalent bonds, we want to look at the lone pairs in order to determine whether a bond will form, not the charges. We need to check that an atom has a lone pair of electrons that it can donate, so a coordinate covalent bond can form.

[Michelle Xie 2B]

In a coordinate covalent bond, the nonmetal has a lone pair and donates both electrons to the bond.