Lanthanide coordination complexes framed by sodium ions: slow relaxation of the magnetization in the Dy(III) derivative

Konstantatos, Andreas; Sørensen, Mikkel A.; Bendix, Jesper; Weihe, Høgni

doi:10.1039/c7dt00863e

Cited by 26 publications

(10 citation statements)

References 47 publications

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“…The best fit yields values of U eff = 4.56(1) K, τ 0 = 3.54(1) × 10 –4 s, C = 0.168(2) s –1 K – n , and n = 6.59(2), demonstrating a fast-relaxing system with an important two-phonon Raman contribution (Figure d). , The parameter n deviates from the expected Kramers ions, that is, n = 9; however, this parameter has been found to be contingent upon the electronic structure of the system. − Moreover, the absence of a temperature independent τ(1/ T ) at low temperatures indicate that the H DC is efficient in suppressing QTM. The asymmetry of the semicircles of the Cole–Cole plot is a qualitative sign of the presence of more than one relaxation process.…”

Section: Resultsmentioning

confidence: 94%

Exchange-Bias Quantum Tunneling of the Magnetization in a Dysprosium Dimer

et al. 2021

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Single-molecule magnets (SMMs) have been shown to possess bewildering phenomena leading to their proposal in several futuristic applications ranging from data storage devices to the basic unit of quantum computers. The main characteristic for the proposal of SMMs in such schemes is their inherent and intriguing quantum mechanical properties, which in turn, could be exploited in novel devices with larger capacities, such as for data storage or enhanced properties, such as quantum computers. In the quest of SMMs displaying such intriguing quantum effects, herein, we explore the synthesis, structural, and magnetic characterization of a dimeric dysprosium-based SMM composed of a tetradentate Schiff-base ligand with formula [Dy 2 (HL) 2 (benz) 2 (NO 3 ) 2 ]. Magnetic studies show that the complex is an SMM, while sub-Kelvin μ-SQUID studies revealed the exchange-bias characteristics of the system attributed to the presence of exchange interaction between the Dy 3+ pair.

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Section: Resultsmentioning

confidence: 94%

Exchange-Bias Quantum Tunneling of the Magnetization in a Dysprosium Dimer

et al. 2021

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“…These rates in turn determines both optical and magnetic properties. [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] When it comes to optical properties, europium(III) is particular sensitive as both ground and main emissive state are isolated states, and the transition between them is nominally forbidden. In this work, we use europium(III) luminescence as a probe of coordination geometry in the ten-coordinated lanthanide sulfates-that is in three of the six structures investigated as the rest are not luminescent.…”

Section: Introductionmentioning

confidence: 99%

Delicate, a study of structural change in ten-coordinated La(III), Ce(III), Pr(III), Nd(III), Sm(III) and Eu(III) sulfates

Thomsen

Sørensen

2022

Preprint

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We recently presented a new method that allows for a direct structural comparison of coordination complexes. The main difference to other approaches is that our AlignIT approach uses a common scaling and orientation of the complexes, when computing the symmetry deviation values, σideal. Here, six apparently isostructural lanthanide(III) sulfates K6[(Ln)2(SO4)6]/K5Na[(Ln)2(SO4)6] with ten-coordinated lanthanide(III) sites (Ln(O)10) were prepared, and the single-crystal structures were determined and compared using the symmetry deviation values (σideal). The six structures were shown to fall in two groups, Pr(III) and Eu(III) are identical (σideal = 0.04) bar size. With a maximum σideal of 0.07, the same was found to be true for the La(III), Ce(III), Nd(III), Sm(III) structures. The two groups are shown to be significantly different (σideal > 2.7), yet the coordination geometry of all six are best described as bicapped square antiprisms (σideal = 1.15-1.68). The structures differ in more than symmetry as the smaller lanthanides are shown to crystallize with one sodium and five potassium ions, while the larger crystallize with six potassium ions. This does not change the structure and we postulate that the structural variation is due to a delicate size matching between alkali and lanthanide ions. For the first six lanthanides this structure is very robust, which is confirmed as seven doped systems readily crystallized. These doped systems were prepared in order to use europium(III) luminescence as a structural probe. Unsurprisingly, only the doped Eu-La and Eu-Ce systems were found to be luminescent. Between these two and the all-europium(III) system, the intricate structural differences were shown to be enough to change both crystal field splitting and luminescence lifetime. We conclude that even simple dilution experiments of luminescent lanthanide(III) ions in innocent hosts must consider that actual structure can act as a modulator for the observed properties.

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“…This group of luminescent polymer materials includes, among others, coordination polymers (CPs). They are an important group of materials owing to their diverse crystal structures and extensive application, such as in gas adsorption/separation, heterogeneous catalysis, luminescent probe, drug delivery, magnetism, guest/ion-exchange, and catalysis [1][2][3][4][5][6]. Trivalent rare earth elements (lanthanides), similar to other selected metals and their metal organic frameworks (MOFs), are characterized by good photoactive properties-e.g., a broad emission region or color intensity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polymer Composites with Luminescent Properties

Gargol

Podkościelna

2020

The 1st International Electronic Conference on Applied Sciences

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This paper presents the synthesis and characterization of new polymeric materials in the form of composites with a luminescent filler using the photopolymerization methodology. In the synthesis of the composites, bisphenol A glycerolate (1 glycerol/phenol) diacrylate was used as a main monomer, whereas methyl methacrylate, N-vinyl-2-pyrrolidone, and 2-hydroxyethyl methacrylate were applied as reactive diluents. In the role of photoluminescent dopant, a previously synthesized photoluminescent copolymer, N-vinyl-2-pyrrolidone witch 2,7-(2-hydroxy-3-methacryloyloxypropoxy)naphthalene, was used. The compositions were prepared with an increasing amount of filler: 0, 0.5, 1, 2, 5, 10 wt%. As a result of the performed syntheses, 18 new compositions were obtained which generated green-yellow light after excitation by UV radiation. The influence of the increasing luminescent filler content on the selected properties of the composites was evaluated. The thermal and mechanical behaviors of the composites were determined by means of differential scanning calorimetry (DSC) and Shore D hardness. Moreover, the chemical structures of the polymeric materials were confirmed by the attenuated total reflectance Fourier transform infrared spectroscopy (ATR/FT-IR) method. These results show that the incorporation of the photoluminescent copolymer into polymeric compositions can be method for obtaining functional materials for the production of special polymeric coatings or for the production of optical fiber sensors.

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Lanthanide coordination complexes framed by sodium ions: slow relaxation of the magnetization in the Dy(III) derivative

Cited by 26 publications

References 47 publications

Exchange-Bias Quantum Tunneling of the Magnetization in a Dysprosium Dimer

Exchange-Bias Quantum Tunneling of the Magnetization in a Dysprosium Dimer

Delicate, a study of structural change in ten-coordinated La(III), Ce(III), Pr(III), Nd(III), Sm(III) and Eu(III) sulfates

Synthesis of Polymer Composites with Luminescent Properties

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