| http://www.w3.org/ns/prov#value | - bidentate Schiff base ligand; Lc is a carbene ligand, preferably selected from the group consisting of alkylidene ligands, vinylidene ligands, indenylidene ligands and allenylidene ligands; L is a non-anionic ligand, preferably other than a phosphine ligand; X1, X2 and X3 are each independently selected from anionic ligands; and X??? is an anion, including salts, solvates and enantiomers thereof.
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