Synthesis and characterization of new heterodinuclear (4f, 4f′) lanthanide complexes

• Published in: Journal of alloys and compounds Vol. 374; no. 1; pp. 377 - 381
• Main Authors: Costes, Jean-Pierre, Novitchi, Ghenadie, Lebrun, Colette
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 14.07.2004; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Coordination sites; Exact sciences and technology; Lanthanide complexes; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Nuclear magnetic resonance and relaxation; Physics; Schiff base ligand; Schiff base ligand; Lanthanide complexes; Coordination sites; Synthesis; Rare earths; Nuclear magnetic resonance; Organic compounds; Methanol
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2003.11.025

A tripodal compartmental Schiff base ligand resulting from reaction of 3-ethoxysalicylaldehyde and tris(2-aminoethyl)amine can yield heterodinuclear lanthanide complexes in which the Ln ions are coordinated in the inner N 4O 3 and the outer O 3O 3 sites. The key compound in this synthetic route is the neutral mononuclear complex in which the lanthanide ion is chelated in the inner N 4O 3 coordination site. Introduction of the second lanthanide ion as a trifluoroacetate salt yields heterodinuclear entities which are soluble enough to be characterized by electrospray mass spectrometry techniques. With the help of the lanthanide induced shifts observed in the 1 H NMR spectra of different heterodinuclear complexes, we have been able to confirm that the equivalent chloride species are not subject to scrambling in methanol solution.