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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Suturina, Elizaveta A.
University of Bath
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2022Toward Opto-Structural Correlation to Investigate Luminescence Thermometry in an Organometallic Eu(II) Complexcitations
- 2020Metal-organic magnets with large coercivity and ordering temperatures up to 242°Ccitations
- 2018Spin state in perfluorinated FePc films on Cu(111) and Ag(111) in dependence on film thicknesscitations
- 2017Spin dynamics of light-induced charge separation in composites of semiconducting polymers and PC60BM revealed using Q-band pulse EPRcitations
- 2013Bis(toluene)chromium(I) [1,2,5]Thiadiazolo[3,4-c ][1,2,5]thiadiazolidyl and [1,2,5]Thiadiazolo[3,4-b ]pyrazinidylcitations
- 2010Heterospin π-heterocyclic radical-anion saltcitations
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article
Bis(toluene)chromium(I) [1,2,5]Thiadiazolo[3,4-c ][1,2,5]thiadiazolidyl and [1,2,5]Thiadiazolo[3,4-b ]pyrazinidyl
Abstract
<p>Bis(toluene)chromium(0), Cr<sup>0</sup>(η<sup>6</sup>-C <sub>7</sub>H<sub>8</sub>)<sub>2</sub> (3), readily reduced [1,2,5] thiadiazolo[3,4-c][1,2,5]thiadiazole (1) and [1,2,5]thiadiazolo[3,4-b]pyrazine (2) in a tetrahydrofuran solvent with the formation of heterospin, S<sub>1</sub> = S<sub>2</sub> = <sup>1</sup>/<sub>2</sub>, radical-ion salts [3] <sup>+</sup>[1]<sup>-</sup> (4) and [3]<sup>+</sup>[2]<sup>-</sup> (5) isolated in high yields. The salts 4 and 5 were characterized by single-crystal X-ray diffraction (XRD), solution and solid-state electron paramagnetic resonance, and magnetic susceptibility measurements in the temperature range 2-300 K. Despite the formal similarity of the salts, their crystal structures were very different and, in contrast to 4, in 5 anions were disordered. For the XRD structures of the salts, parameters of the Heisenberg spin Hamiltonian were calculated using the CASSCF/NEVPT2 and broken-symmetry density functional theory approaches, and the complex magnetic motifs featuring the dominance of antiferromagnetic (AF) interactions were revealed. The experimental χT temperature dependences of the salts were simulated using the Van Vleck formula and a diagonalization of the matrix of the Heisenberg spin Hamiltonian for the clusters of 12 paramagnetic species with periodic boundary conditions. According to the calculations and χT temperature dependence simulation, a simplified magnetic model can be suggested for the salt 4 with AF interactions between the anions ([1]<sup>-</sup>⋯[1]<sup>-</sup>, J<sub>1</sub> = -5.77 cm<sup>-1</sup>) and anions and cations ([1]<sup>-</sup>⋯[3]<sup>+</sup>, J<sub>2</sub> = -0.84 cm<sup>-1</sup>). The magnetic structure of the salt 5 is much more complex and can be characterized by AF interactions between the anions, [2] <sup>-</sup>⋯[2]<sup>-</sup>, and by both AF and ferromagnetic (FM) interactions between the anions and cations, [2]<sup>-</sup>⋯[3] <sup>+</sup>. The contribution from FM interactions to the magnetic properties of the salt 5 is in qualitative agreement with the positive value of the Weiss constant Θ (0.4 K), whereas for salt 4, the constant is negative (-7.1 K).</p>