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Issue 34, 2017
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Ln(III) complexes (Ln = Eu, Gd, Tb, Dy) with a chiral ligand containing 1,10-phenanthroline and (–)-menthol fragments: synthesis, structure, magnetic properties and photoluminescence

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Abstract

A series of lanthanide(III) complexes based on the new chiral ligand L, which contains 1,10-phenanthroline and (–)-menthol fragments, namely [LnL2(NO3)3] (Ln = Eu (1), Gd (2), Tb (3), Dy (4)), have been synthesized and structurally characterized. Complexes 1–4 are isostructural and crystallize in the non-centrosymmetric space group P41212. The mononuclear complexes comprise a 10-coordinate Ln3+ ion with two bidentate N,N-donor ligands (L) and three bidentate chelating nitrate groups. The magnetic properties of complexes 1–4 are determined mainly by the Ln3+ ions. In the case of complexes 3 and 4, significant anisotropy results in nonlinear field dependences of magnetization at low temperature. Complexes 1, 3 and 4 exhibit metal-centered red (Eu3+), green (Tb3+) and yellow (Dy3+) luminescence, respectively, whereas complex 2 displays blue ligand-based luminescence in the solid state at room temperature. The luminescence quantum yield for the solid samples increases in the order 4 < 23 < 1. The europium(III) complex shows long luminescence lifetimes (up to 1750 μs) and a very high quantum yield (φf = 0.87); these make this compound promising for application in sensing and optoelectronics.

Graphical abstract: Ln(iii) complexes (Ln = Eu, Gd, Tb, Dy) with a chiral ligand containing 1,10-phenanthroline and (–)-menthol fragments: synthesis, structure, magnetic properties and photoluminescence

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Publication details

The article was received on 27 Apr 2017, accepted on 02 Aug 2017 and first published on 02 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT01536D
Citation: Dalton Trans., 2017,46, 11440-11450
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    Ln(III) complexes (Ln = Eu, Gd, Tb, Dy) with a chiral ligand containing 1,10-phenanthroline and (–)-menthol fragments: synthesis, structure, magnetic properties and photoluminescence

    S. V. Larionov, Y. A. Bryleva, L. A. Glinskaya, V. F. Plyusnin, A. S. Kupryakov, A. M. Agafontsev, A. V. Tkachev, A. S. Bogomyakov, D. A. Piryazev and I. V. Korolkov, Dalton Trans., 2017, 46, 11440
    DOI: 10.1039/C7DT01536D

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