Rational Design of a Lanthanide‐Based Complex Featuring Different Single‐Molecule Magnets

Abstract

The rational synthesis of the 2-{1-methylpyridine-N-oxide-4,5-[4,5-bis(propylthio)tetrathiafulvalenyl]-1H-benzimidazol-2-yl}pyridine ligand (L) is described. It led to the tetranuclear complex [Dy4(tta)12(L)2] (Dy-Dy2-Dy) after coordination reaction with the precursor Dy(tta)3⋅2 H2O (tta(-) = 2-thenoyltrifluoroacetonate). The X-ray structure of Dy-Dy2-Dy can be described as two terminal mononuclear units bridged by a central antiferromagnetically coupled dinuclear complex. The terminal N2O6 and central O8 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-Dy2-Dy is a self-assembly of two known mononuclear SMMs bridged by a known dinuclear SMM.

Photophysical and Magnetic Properties in Complexes Containing 3d/4f Elements and Chiral Phenanthroline‐Based Helicate‐Like Ligands

“…The Fe–N bond lengths [2.201(10) Å] are longer than the Fe–O bond lengths [2.083(9) Å] and indicate a high‐spin Fe II ion. The crystallization of the same final product starting from the Fe(NCS) 2 precursor gives us confidence that the driving force for the formation of the 3d/4f heterodimetallic compound 7 is the formation of the [Dy(tta) 4 ] – anion assisted by the labile ancillary tta – ligands …”

Decorated Tetrathiafulvalene‐Based Ligands: Powerful Chemical Tools for the Design of Single‐Molecule Magnets

“…the bischelating benzimidazol‐2‐pyridine and pyridine‐4‐oxide fragments. As predicted the association of L 7 with two equivalents of Dy(tta) 3 · 2H 2 O precursor led to the rational design of the tetranuclear [Dy 4 (tta) 12 ( L 7 ) 2 ] · (C 6 H 14 ) 4 complex ( 10 ) (Figure ) . The tetranuclear complex 10 is composed of two external Dy(III) ions linked to the bischelating coordination site of the common molecular skeleton.…”

“…Color code: carbon: gray, nitrogen: blue, oxygen: red, sulfur: yellow, fluoride: light green and dysprosium: light blue. Adapted from ref …”

Photo-physical properties of donor-acceptor-radical triad based on functionalized tetrathiafulvalene and nitronyl nitroxide radical

“…In our group, a family of donor-acceptor dyads based on the 2-(4,5-(4,5-bis(propylthio)-tetrathiafulvalenyl)-1H-benzimidazol-2-yl)-pyridine molecular skeleton 1 [37], [38] has been previously designed and alkylated with various organic moieties such as 2-pyridyl [39], dimethyl-2,2'-bipyridyl, [40] di-(pyrazol-1-yl)-4-pyridyl [40] and 4-pyridyl-Noxide [41]. In the present work, following this synthetic strategy, 1 has been alkylated with …”