Friday, 1 May 2015

bond - Do ligands with a positive charge exist?


Are there positively charged ligands which can bind to a central metal atom to form coordination compounds?


My thoughts:


I know that ligands are Lewis bases which donate a pair of electrons, and the central metal atom is usually a Lewis acid.


However, a positive charge on a species usually means it is electron-deficient. In that case, there would be no suitable electrons for it to bond to the central metal atom. So, even if positively charged ligands do exist, I think there would be very few. In such cases, it might bond with central atom which is electron rich forming the coordinate bond in the opposite way. Is that possible?




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