A new family of octanuclear Cu4Ln4 (Ln = Gd, Tb and Dy) spin clusters

Abstract

The reaction of Cu(OAc)2 and Ln(OAc)3 (Ln = Gd, Tb and Dy) with 2-amino-2-methyl-1,3-propanediol (ampdH2) under solvothermal conditions has afforded a new family of isostructural octanuclear Cu4Ln4 complexes with the formula [Cu4Ln4(OAc)12(ampdH)8(OH2)2] (Ln = Gd (1), Tb (2) and Dy(3)) in good yield. Variable temperature magnetic susceptibility measurements reveal weak intramolecular exchange interactions for 1 and 2. Ferromagnetic coupling is observed for 1 and attributed to Cu...Gd interactions. In contrast, the magnetic susceptibility behaviour of 2 arises from a combination of intramolecular exchange interactions and the crystal field splitting of the (7)F6 ground state of the Tb(III) ions.

Synthesis, Structure and Magnetic Properties of Mn2Tb2 Tetranuclear Complex with p‐tert‐Butylthiacalix[4]arene

“…[6][7][8][9][10] It is known that multidentate ligands are effective for the construction of polynuclear heterometallic compounds. [11][12][13] Calix [n]arenes are a suitable synthetic platform for spatial arrangement of binding groups, thus providing the possibility to use them for synthesis of multinuclear metal ion complexes. [14,15] Modification of the calix[n]arenes by replacement of the methylene bridging groups with the sulfur bridging groups, thus yielding the family of thiacalix[n]arenes, provides additional sites for the metal coordination.…”

Diol-type ligands as central ‘players’ in the chemistry of high-spin molecules and single-molecule magnets

“…Even during the last weeks before the submission of this Perspective, papers describing interesting clusters with these diol-type ligands continue to appear. For example, Boscovic and co-workers have just reported 93 ). The eight ampHligands all bind in an h 2 :h 1 :m mode (Scheme 6); this mode has not previously been reported for this ligand (see Fig.…”

[2,2′-(1,1′-Binaphthyl-2,2′-diyldiimino)diethanol-κ3N,N′,O]dichloridocopper(II)

“…For background to metal complexes containing N-substituted diethanolamine ligands, see: Saalfrank et al (2008); Ferguson et al (2011); Alley et al (2008). For the synthesis of the ligand, see: Yan et al (2008).…”

“…(2011). E67, m1844 (Saalfrank et al, 2008;Ferguson et al, 2011;Alley et al, 2008). But the ligand which contains two or more N-substituted diethanolamine has received much less attention.…”