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Strong field ligands are ligands that cause a large splitting of the d orbitals in a transition metal complex. This splitting results in a large energy gap between the d orbitals, making the complex less likely to undergo reactions that involve electron transfer. Some examples of strong field ligands include:
Cyanide (CN-)
Carbon monoxide (CO)
Nitrite (NO2-)
Ethylene diamine (en)
Oxalate (C2O42-)
Carbonyl (CO)