COMPLEXES OF LANTHANIDE(III) SALTS WITHN,N′ - BIS(2′ - PYRIDINECARBOXAMIDE) - 1, 8 - NAPTHALENE

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Abstract A survey of the literature on lanthanide (III) coordination compounds reveals that ligands involving secondary amide groups as donor sites have received little attention.1,2 N,N ' -bis(2 ' -pyridinecarboxamide)-1,8-naphthalene (LH2, I), a potentially tetradentate bis-amide ligand, has been shown to coordinate to transition metal ions in several modes.3–5 As part of our systematic investigation of metal-amide interactions,3–6 we have prepared and studied new complexes of lanthanide(III) bromides, nitrates, perchlorates and thiocyanates with LH2. Some preliminary results of this work, concerning rare earth chloride -LH2 interactions, have been published elsewhere.7