Given chlorine is an anionic ligand, there is a sharing of electrons between Cl and the metal ion (definition of covalent bonding). Can the bonding between be considered Co-ordinate? if so why?
I don't understand your question.
Chloride anion can be just a counter-ion in complexes
Bonding in coordination complexes can be explained by different theories. In case of valance bond theory the hybridization is being done including ligand shared electrons but excluding metal electrons. I think from here one can draw the concept of coordinate bonding. But in practice from quantum mechanical point of view VBT gives the idea of covalent along with little amount of ionic interection. According to Crystal Field Theory it has been totally assumed that bonding in coordination complexes is ionic irrespective of anything. On the other hand in ligand field theory one can get the complete idea of bonding where one can observe the equal contribution of electrons. So in general we say coordinate bonding but in reality the scenario is different.
Any nucleophilic or electron rich species can be considered as ligand.
Chloride is π donor ligand.
Ligands can be either neutral or anionic. Wilkinson's catalyst. RhCl(PPh3)3,
Chlorotris (triphenylphopshine) rhodium (I). is a typical example where chloride satisfies both primary and secondary valencies. If it satisfices only the primary valency, then it becomes a counter ion. Even the representation of covalent and coordinate bond remains the same unlike in the earlier days.
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