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Rational Design of a Lanthanide‐Based Complex Featuring Different Single‐Molecule Magnets
Author(s) -
Pointillart F.,
Guizouarn T.,
Lefeuvre B.,
Golhen S.,
Cador O.,
Ouahab L.
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201502416
Subject(s) - dysprosium , lanthanide , crystallography , single molecule magnet , magnetism , magnet , rational design , ligand (biochemistry) , antiferromagnetism , molecule , chemistry , pyridine , magnetic susceptibility , materials science , stereochemistry , magnetization , nanotechnology , condensed matter physics , physics , inorganic chemistry , magnetic field , receptor , ion , biochemistry , organic chemistry , quantum mechanics , medicinal chemistry
The rational synthesis of the 2‐{1‐methylpyridine‐ N ‐oxide‐4,5‐[4,5‐bis(propylthio)tetrathiafulvalenyl]‐1 H ‐benzimidazol‐2‐yl}pyridine ligand ( L ) is described. It led to the tetranuclear complex [Dy 4 (tta) 12 ( L ) 2 ] ( Dy‐Dy 2 ‐Dy ) after coordination reaction with the precursor Dy(tta) 3 ⋅2 H 2 O (tta − =2‐thenoyltrifluoroacetonate). The X‐ray structure of Dy‐Dy 2 ‐Dy can be described as two terminal mononuclear units bridged by a central antiferromagnetically coupled dinuclear complex. The terminal N 2 O 6 and central O 8 environments are described as distorted square antiprisms. The ac magnetism measurements revealed a strong out‐of‐phase signal of the magnetic susceptibility with two distinct sets of data. The high‐ and low‐frequency components were attributed to the two terminal mononuclear single‐molecule magnets (SMMs) and the central dinuclear SMM, respectively. A magnetic hysteresis loop was detected at very low temperature. From both structural and magnetic points of view, the tetranuclear SMM Dy‐Dy 2 ‐Dy is a self‐assembly of two known mononuclear SMMs bridged by a known dinuclear SMM.