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Issue 44, 2012
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Field-induced slow magnetic relaxation in chiral seven-coordinated mononuclear lanthanide complexes

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Abstract

Four couples of enantiomerically pure chiral seven-coordinated mononuclear lanthanide complexes, [(LOEt)Dy((R,R)-Salphen)]2·3H2O (1, LOEt = [(Cp)Co(P(O)(OEt)2)3], Cp = cyclopentadiene, Salphen = N,N′-1,2-diphenylethylenebis(salicylideneiminato) dianion), [(LOEt)Dy((S,S)-Salphen)]2·3H2O (2), [(LOEt)Dy((R,R)-5-Cl-Salcy)]·CH3OH·1/8H2O (3, Salcy = N,N′-(1,2-cyclohexanediylethylene)bis(salicylideneiminato) dianion), [(LOEt)Dy((S,S)-5-Cl-Salcy)]·CH3OH·1/8H2O (4), [(LOEt)Tb((R,R)-5-Cl-Salcy)]·CH3OH·1/8H2O (5), [(LOEt)Tb((S,S)-5-Cl-Salcy)]·CH3OH·1/8H2O (6), [(LOEt)Ho((R,R)-5-Cl-Salcy)]·CH3OH·1/8H2O (7) and [(LOEt)Ho((S,S)-5-Cl-Salcy)]·CH3OH·1/8H2O (8), have been successfully synthesized by using tetradentate chiral salen-type ligands and the Kläui's tripodal ligand of LOEt. Structural analyses reveal that all compounds have a typical double-decker sandwich structure, and the Ln(III) ions exhibit a rare seven-coordinated mode, situating in a distorted monocapped triangular prism polyhedron. Circular dichroism (CD) spectra confirm the enantiomeric nature of the optically active complexes and demonstrate that the chirality is successfully transferred from the ligand to the coordination environment of the Ln(III) ions. Field-induced slow relaxation of the magnetization is observed for complexes 1–4, suggesting that they can be rare chiral single-ion magnets (SIMs) based on the seven-coordinated lanthanide ions.

Graphical abstract: Field-induced slow magnetic relaxation in chiral seven-coordinated mononuclear lanthanide complexes

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Publication details

The article was received on 05 Jun 2012, accepted on 30 Jul 2012 and first published on 02 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT31203D
Citation: Dalton Trans., 2012,41, 13682-13690
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    Field-induced slow magnetic relaxation in chiral seven-coordinated mononuclear lanthanide complexes

    M. Yao, Q. Zheng, F. Gao, Y. Li, Y. Song and J. Zuo, Dalton Trans., 2012, 41, 13682
    DOI: 10.1039/C2DT31203D

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