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Issue 37, 2013
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Series of dinuclear and tetranuclear lanthanide clusters encapsulated by salen-type and β-diketionate ligands: single-molecule magnet and fluorescence properties

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Abstract

Three dinuclear [Ln2H2OL12(acac)2]·solvent (1, Ln = Gd, solvent = 2CH2Cl2; 2, Ln = Tb, no solvent; 3, Ln = Er, solvent = (C2H5)2O), and two tetranuclear lanthanide clusters [Ln43-OH)2L22(acac)6]·2(solvent) (4, Ln = Tb, solvent = CH3OH; 5, Ln = Dy, solvent = CH3CN) were characterized in terms of structure, fluorescence and magnetism. The dinuclear lanthanide complexes were constructed by a rigid salen-type ligand H2L1 = N,N′-bis(salicylidene)-o-phenylenediamine and β-diketonate (acac = acetylacetonate) ligands, while the tetranuclear clusters were formed from the flexible ligand H2L2 = N,N′-bis(salicylidene)-1,2-ethanediamine. Crystal structure analysis indicates that the rigid ligand favors the double-decker sandwich structure (Ln2L12), in which the two lanthanide ions have different coordination numbers and geometry, while the more flexible ligand (H2L2) leads to planar tetranuclear clusters. The relationship between their respective magnetic anisotropy and ligand-field geometries and their fluorescence properties was investigated. The Dy and Tb-containing clusters exhibit typical visible fluorescence properties, and single-molecule magnet behavior is seen in complex 5.

Graphical abstract: Series of dinuclear and tetranuclear lanthanide clusters encapsulated by salen-type and β-diketionate ligands: single-molecule magnet and fluorescence properties

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Publication details

The article was received on 10 May 2013, accepted on 06 Jun 2013 and first published on 11 Jun 2013


Article type: Paper
DOI: 10.1039/C3DT51227D
Dalton Trans., 2013,42, 13397-13403

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    Series of dinuclear and tetranuclear lanthanide clusters encapsulated by salen-type and β-diketionate ligands: single-molecule magnet and fluorescence properties

    W. Sun, B. Han, P. Lin, H. Li, P. Chen, Y. Tian, M. Murugesu and P. Yan, Dalton Trans., 2013, 42, 13397
    DOI: 10.1039/C3DT51227D

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