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- Title
Homometallic Dy<sup>III</sup> Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism.
- Authors
Biswas, Sourav; Das, Sourav; Acharya, Joydev; Kumar, Vierandra; van Leusen, Jan; Kögerler, Paul; Herrera, Juan Manuel; Colacio, Enrique; Chandrasekhar, Vadapalli
- Abstract
The synthesis, structure, and magnetic properties of four DyIII coordination compounds isolated as [Dy2(LH2)2(μ2-η1:η1-Piv)]Cl ⋅2 MeOH ⋅H2O ( 1), [Dy4(LH)2(μ3-OH)2(Piv)4(MeOH)2] ⋅4 MeOH ⋅2 H2O ( 2), [Dy6(LH2)3(tfa)3(O3P tBu)(Cl)3]Cl4 ⋅15.5 H2O ⋅4 MeOH ⋅5 CHCl3 ( 3) and [Dy21(L)7(LH)7(tfa)7]Cl7 ⋅15 H2O ⋅7 MeOH ⋅12 CHCl3 ( 4) are reported (Piv=pivalate, tfa=1,1,1-trifluoroacetylacetone, O3P tBu= tert-butylphosphonate). Among these, 3 displays an equilateral triangle topology with a side length of 9.541 Å and a rare pentagonal-bipyramidal Dy3+ environment, whereas complex 4 exhibits a single-stranded nanowheel structure with the highest nuclearity known for a homometallic lanthanide cluster structure. A tentative model of the dc magnetic susceptibility and the low-temperature magnetization of compounds 1 and 2 indicates that the former exhibits weak ferromagnetic intramolecular exchange interaction between the Dy3+ ions, whereas in the latter both intramolecular ferromagnetic and antiferromagnetic magnetic exchange interactions are present. Compounds 1, 3, and 4 exhibit frequency-dependent ac signals below 15 K at zero bias field, but without exhibiting any maximum above 2 K at frequencies up to 1400 Hz. The observed slow relaxation of the magnetization suggests that these compounds could exhibit single molecule magnet (SMM) behavior with either a thermal energy barrier for the reversal of the magnetization that is not high enough to block the magnetization above 2 K, or there exists quantum tunneling of the magnetization (QTM).
- Subjects
DYSPROSIUM compounds; RARE earth metal compound synthesis; CRYSTAL structure; MAGNETIC properties of metals; MOLECULAR interactions
- Publication
Chemistry - A European Journal, 2017, Vol 23, Issue 21, p5154
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201700471