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If a ligand has an atom with 2 pairs of lone electrons (like H2O), why is it not able to donate both pairs of electrons to the central atom? Is it possible for a double or triple bond to be formed in a complex between a central atom and an atom in the ligand?
When ligands are bonded to a metal or transition metal, they are bound by sharing electrons. Since it only takes 2 electrons to form a bond that can be shared between the complex and the ligand, double and triple bonds are not required as far as I know. Not completely sure though, hope this helped!
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