A Multifunctional Magnetic Material under Pressure

Rodríguez-Velamazán, J. A.; Fabelo, Óscar; Beavers, Christine M.; Natividad, Eva; Evangelisti, Marco; Roubeau, Olivier

doi:10.1002/chem.201402046

Cited by 17 publications

(8 citation statements)

References 59 publications

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“…Indexing and data reduction is also handled in APEX3, but high-pressure users need to employ additional tools, either internal to APEX3 or external (ECLIPSE [56]), to mask detector regions obscured by the DAC body. This beamline is mostly aimed at chemical crystallography, and high-pressure studies have investigated spin crossover events [63], negative linear compressibility [64], and MOF resilience under compression [65].…”

Section: Beamline 1131 and 1221mentioning

confidence: 99%

“…With high quality data, the structural response to pressure can be studied on an atom-by-atom level. Recent reports of high pressure applied to chemical compounds have been investigating compressibility [65] and other material properties [64], but also intermolecular interactions [68], spin transitions [63] and phase changes [52]. In this example, a MOF was subjected to high pressure, and then compared to the high-pressure behavior of the same MOF after it had been augmented with a reinforcing organic molecule [53].…”

Section: Chemistrymentioning

confidence: 99%

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X-Ray Diffraction under Extreme Conditions at the Advanced Light Source

Stan

Beavers

Kunz

et al. 2018

QuBS

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Abstract:The more than a century-old technique of X-ray diffraction in either angle or energy dispersive mode has been used to probe materials' microstructure in a number of ways, including phase identification, stress measurements, structure solutions, and the determination of physical properties such as compressibility and phase transition boundaries. The study of high-pressure and high-temperature materials has strongly benefitted from this technique when combined with the high brilliance source provided by third generation synchrotron facilities, such as the Advanced Light Source (ALS) (Berkeley, CA, USA). Here we present a brief review of recent work at this facility in the field of X-ray diffraction under extreme conditions, including an overview of diamond anvil cells, X-ray diffraction, and a summary of three beamline capabilities conducting X-ray diffraction high-pressure research in the diamond anvil cell.

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Section: Beamline 1131 and 1221mentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

X-Ray Diffraction under Extreme Conditions at the Advanced Light Source

Stan

Beavers

Kunz

et al. 2018

QuBS

View full text Add to dashboard Cite

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“…SCO events can result in huge variations in a material's structure, conductivity, or magnetic properties. Pressure-induced spin crossover has been studied in [FeL12] (ClO4)2 (L1 = 2,6-bis[3-methylpyrazol-1-yl]-pyrazine) [49] and in Fe II (Metz)6](Fe III Br4)2 (Metz = methyltetrazole) [50].…”

Section: High Pressurementioning

confidence: 99%

Chemical Crystallography at the Advanced Light Source

et al. 2017

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Chemical crystallography at synchrotrons was pioneered at the Daresbury SRS station 9.8. The chemical crystallography beamlines at the Advanced Light Source seek to follow that example, with orders of magnitude more flux than a lab source, and various in situ experiments. This article attempts to answer why a chemist would require synchrotron X-rays, to describe the techniques available at the ALS chemical crystallography beamlines, and place the current facilities in a historical context.

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“…One area where this approach has made a significant impact is in the field of magnetism. Herein, we highlight our efforts in developing magneto-structural correlations in transition metal molecule-based magnets; we do not attempt to cover examples from other researchers, which are many and varied [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. At the outset, what we hoped to observe was that applied pressure would change bond lengths and angles around the metal centres, and that that would lead to changes in magnetic exchange interactions and/or magneto-anisotropies.…”

Section: Introductionmentioning

confidence: 99%

Putting the Squeeze on Molecule-Based Magnets: Exploiting Pressure to Develop Magneto-Structural Correlations in Paramagnetic Coordination Compounds

et al. 2020

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The cornerstone of molecular magnetism is a detailed understanding of the relationship between structure and magnetic behaviour, i.e., the development of magneto-structural correlations. Traditionally, the synthetic chemist approaches this challenge by making multiple compounds that share a similar magnetic core but differ in peripheral ligation. Changes in the ligand framework induce changes in the bond angles and distances around the metal ions, which are manifested in changes to magnetic susceptibility and magnetisation data. This approach requires the synthesis of a series of different ligands and assumes that the chemical/electronic nature of the ligands and their coordination to the metal, the nature and number of counter ions and how they are positioned in the crystal lattice, and the molecular and crystallographic symmetry have no effect on the measured magnetic properties. In short, the assumption is that everything outwith the magnetic core is inconsequential, which is a huge oversimplification. The ideal scenario would be to have the same complex available in multiple structural conformations, and this is something that can be achieved through the application of external hydrostatic pressure, correlating structural changes observed through high-pressure single crystal X-ray crystallography with changes observed in high-pressure magnetometry, in tandem with high-pressure inelastic neutron scattering (INS), high-pressure electron paramagnetic resonance (EPR) spectroscopy, and high-pressure absorption/emission/Raman spectroscopy. In this review, which summarises our work in this area over the last 15 years, we show that the application of pressure to molecule-based magnets can (reversibly) (1) lead to changes in bond angles, distances, and Jahn–Teller orientations; (2) break and form bonds; (3) induce polymerisation/depolymerisation; (4) enforce multiple phase transitions; (5) instigate piezochromism; (6) change the magnitude and sign of pairwise exchange interactions and magnetic anisotropy, and (7) lead to significant increases in magnetic ordering temperatures.

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A Multifunctional Magnetic Material under Pressure

Cited by 17 publications

References 59 publications

X-Ray Diffraction under Extreme Conditions at the Advanced Light Source

X-Ray Diffraction under Extreme Conditions at the Advanced Light Source

Chemical Crystallography at the Advanced Light Source

Putting the Squeeze on Molecule-Based Magnets: Exploiting Pressure to Develop Magneto-Structural Correlations in Paramagnetic Coordination Compounds

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