Salen ligand
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A Salen ligand is a dianionic and tetradendate ligand in an organometallic complex. Salen is a contraction for salicylic aldehyde and ethylene diamine which are the reactants for the ligand. The actual composition of the ligand depends on the various substituents. For example Salph is a salen ligand with a Phenyl core group from the imine forming reaction of salicylic aldehyde with o-diaminobenzene.