2021
DOI: 10.1021/acs.inorgchem.1c01217
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Influence of the Different Types of Auxiliary Noncarboxylate Organic Ligands on the Topologies and Magnetic Relaxation Behavior of Zn–Dy Heterometallic Single Molecule Magnets

Abstract: In this work, we first synthesized a Zn−Dy complex, [Zn 6 Dy 2 (L) 6 (tea) 2 (CH 3 OH) 2 ]•6CH 3 OH•8H 2 O (H 2 L = N-3methoxysalicylidene-2-amino-3-hydroxypyridine, teaH 3 = triethanolamine, 1), by employing H 2 L, anhydrous ZnCl 2 , and Dy(NO 3 ) 3 • 5H 2 O reacting with auxiliary ligand teaH 3 in the mixture of CH 3 OH and DMF. When teaH 3 and the solvent CH 3 OH in the reaction system of 1 were replaced by the auxiliary ligand 2,6-pyridinedimethanol (pdmH 2 ) and the solvent MeCN, another Zn−Dy complex, [Z… Show more

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Cited by 21 publications
(22 citation statements)
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“…Recently, we concentrated on the investigation of polynuclear 3d, 3d–4f and 4f complexes, 39,40 in which the topologies and the magnetic relaxation behavior can be regulated by employing two kinds of non-carboxylate organic ligands. For example, 8 when N -3-methoxysalicylidene-2-amino-3-hydroxypyridine (H 2 L′) and triethanolamine (teaH 3 ) reacted with anhydrous ZnCl 2 and Dy(NO 3 ) 3 ·5H 2 O in a CH 3 OH solution, a {Zn 6 Dy 2 } complex can be obtained, which shows the double relaxation behavior. However, when teaH 3 and CH 3 OH solvent were replaced with 2,6-pyridinedimethanol (pdmH 2 ) and solvent CH 3 CN, a {Zn 4 Dy 4 } complex was obtained, which only exhibits a single relaxation process.…”
Section: Resultsmentioning
confidence: 99%
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“…Recently, we concentrated on the investigation of polynuclear 3d, 3d–4f and 4f complexes, 39,40 in which the topologies and the magnetic relaxation behavior can be regulated by employing two kinds of non-carboxylate organic ligands. For example, 8 when N -3-methoxysalicylidene-2-amino-3-hydroxypyridine (H 2 L′) and triethanolamine (teaH 3 ) reacted with anhydrous ZnCl 2 and Dy(NO 3 ) 3 ·5H 2 O in a CH 3 OH solution, a {Zn 6 Dy 2 } complex can be obtained, which shows the double relaxation behavior. However, when teaH 3 and CH 3 OH solvent were replaced with 2,6-pyridinedimethanol (pdmH 2 ) and solvent CH 3 CN, a {Zn 4 Dy 4 } complex was obtained, which only exhibits a single relaxation process.…”
Section: Resultsmentioning
confidence: 99%
“…Notably, the Dy–O bond lengths in 1 are dependent on the nature of the atoms, namely, the bonds formed by the alkoxido-type O atoms of L 3− (Dy1–O9 = 2.287(4) Å and Dy2–O10 = 2.247(4) Å) and the bonds formed by NO 3 − (Dy1–O11 = 2.454(5) Å and Dy2–O14 = 2.537(5) Å) represent the shortest and the longest Dy–O bonds, respectively. The coordination geometries of Dy1 and Dy2 in 1 were determined by SHAPE software, 49 indicating that Dy1 and Dy2 are the triangular dodecahedron 8,15,19,20,29,40 (TDD-8, D 2d ) and the muffin (MFF-9, C s ), 12,29 respectively, as the minimum values for the continuous shape measure (CShM) parameters of Dy1 and Dy2 are 3.061 and 1.971, respectively (Fig. 1b and c and Tables S6 and S7†).…”
Section: Resultsmentioning
confidence: 99%
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“…The weakening of the equatorial ligand field around the Dy 3+ ion has been proven to improve the axiality and SMM properties of Dy 3+ -based SMMs in tandem. 5,32 This is best illustrated by investigating the calculated crystal-field parameters ( B q k ) and visualizing the main magnetic axis of Dy 3+ ion in the studied systems. For all other systems, except for 1 O , the axial crystal-field parameter B 0 2 dominates the crystal ligand field because its value is order of magnitude larger than the values of any other crystal-field parameters, whereas for 1 O the non-axial crystal-field parameters are of the same magnitude or even larger than the axial crystal-field parameters for all values of k (Tables S17–S21, ESI†).…”
Section: Resultsmentioning
confidence: 99%
“…S9†). The Cole–Cole plots are fitted by the extended Debye model using CCFIT software, 50–53 and the given α values and relaxation times ( τ ) are shown in Tables S4 and S5 †. Under zero dc field, the ln( τ ) vs. T −1 curve indicates possible multiple slow relaxation processes described by:where τ QTM represents the QTM process, B is the direct process, C is the coefficient of the Raman process, U eff is the energy barrier for magnetization reversal, k B is the Boltzmann constant and T is temperature.…”
Section: Resultsmentioning
confidence: 99%