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| Naji, M. |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Azam, Siraj |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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Moggach, Stephen
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Publications (7/7 displayed)
- 2023Tandem High-Pressure Crystallography-Optical Spectroscopy Unpacks Noncovalent Interactions of Piezochromic Fluorescent Molecular Rotorscitations
- 2021Poly(2-hydroxyethyl methacrylate) hydrogels doped with copper nanoparticlescitations
- 2021Guest-mediated phase transitions in a flexible pillared-layered metal–organic framework under high-pressurecitations
- 2021(η4-Tetrafluorobenzobarrelene)-η1-((tri-4-fluorophenyl)phosphine)-η1-(2-phenylphenyl)rhodium(I)citations
- 2020Single-Crystal X-Ray Diffraction Study of Pressure and Temperature-Induced Spin Trapping in a Bistable Iron(II) Hofmann Frameworkcitations
- 2020High-pressure sapphire capillary cell for synchrotron single-crystal X-ray diffraction measurements to 1500 barcitations
- 2009High pressure induced spin changes and magneto-structural correlations in hexametallic SMMscitations
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article
High pressure induced spin changes and magneto-structural correlations in hexametallic SMMs
Abstract
<p>The first combined high pressure single-crystal X-ray diffraction and high pressure magnetism study of two polymetallic clusters is presented in an attempt to correlate the observed changes in structure with changes in magnetic response without the need for changes in external ligation. At 1.5 GPa the structure of [Mn6O2(Et-sao)(6)(O2CPh(Me)(2))(2)(EtOH)(6)] (1; Et-saoH(2) = 2-hydroxyphenylpropanone)-a single molecule magnet (SMM) with an effective anisotropy barrier of similar to 86 K-and of [Mn6O2(Et-sao)(6)-(O2C- naphth)(2)(EtOH)(4)(H2O)(2)](2) both undergo significant structural distortions of their metallic skeletons, which has a direct effect upon the observed magnetic response. The application of hydrostatic pressure on the two compounds ( up to 1.5 GPa) flattens the Mn-N-O-Mn torsion angles weakening the magnetic exchange between the metal centres. In both compounds one interaction switches from ferro- to antiferromagnetic, with the Jahn-Teller (JT) axes compressing ( on average) and re-aligning differently with respect to the plane of the three metal centres. High pressure dc chi T-M plots display a gradual decrease in the low temperature peak height and slope, simulations showing a decrease in vertical bar J vertical bar with increasing pressure with a second antiferromagnetic J value required to simulate the data. The "ground states" change from S = 12 to S = 11 for 1 and to S = 10 for 2. Magnetisation data for both 1 and 2 suggest a small decrease in vertical bar D vertical bar, while out-of-phase (chi(M)'') ac data show a large decrease in the effective energy barrier for magnetisation reversal.</p>