Lanthanide mononuclear complexes with a tridentate Schiff base ligand: structures, spectroscopies and properties

A series of six lanthanide mononuclear complexes with a julolidine-quinoline based tridentate Schiff base ligand have been synthesized and structurally characterized. The complexes [NdL2(CH3OH)(NO3)]·CH3OH (1) and [LnL2(NO3)] [Ln = Eu (2), Gd (3), Dy (4), Ho (5), Lu (6)] {HL (C22H21N3O) = ((E)-9-((quinolin-8-ylimino)methyl)-1,2,3,5,6,7-hexahydropyrido[3,2,1-ij]quinolin-8-ol)} all have mononuclear structures with a metal to ligand ratio of 1:2. The Ln(III) ions are nine-fold coordinated by two tridentate Schiff base ligands and a bidentate nitrate anion except for complex 1 in which Nd(III) ion is ten-fold coordinated with an additional MeOH molecule. The coordination of a bidentate nitrate anion makes chirality to the complexes with equal enantiomers presence in the solid state. Lanthanide contraction has been observed with the average Ln–O/Ln–N bond lengths decreasing along the lanthanide series. Vibrational modes (2–5), electronic structures (1–3), thermal stability (2) and magnetic properties (3) have been further investigated and reported. Crown Copyright © 2019 Published by Elsevier Ltd.

Keywords

Rare earths, Quinolines, Schiff bases, Complexes, Magnetic properties, Ligands, Nitrates, Anions

Citation

Zhang, Y., Avdeev, M., Price, J. R., Karatchevtseva, I., Fanna, D. J., Chironi, I., Lu, K. (2019). Lanthanide mononuclear complexes with a tridentate Schiff base ligand: structures, spectroscopies and properties. Polyhedron, 165, 125-131. doi:10.1016/j.poly.2019.03.017

URI

https://doi.org/10.1016/j.poly.2019.03.017
https://apo.ansto.gov.au/dspace/handle/10238/10945

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