0000000000640269
AUTHOR
Mathieu Rouzières
Room-Temperature Magnetic Bistability in a Salt of Organic Radical Ions
International audience; Cocrystallization of 7,7′,8,8′-tetracyanoquinodimethane radical anion (TCNQ −•) and 3-methylpyridinium-1,2,3,5dithiadiazolyl radical cation (3-MepyDTDA +•) afforded isostructural acetonitrile (MeCN) or propionitrile (EtCN) solvates containing cofacial π dimers of homologous components. Loss of lattice solvent from the diamagnetic solvates above 366 K affords a high-temperature paramagnetic phase containing discrete TCNQ −• and weakly bound π dimers of 3-MepyDTDA +• , as evidenced by X-ray diffraction methods and magnetic susceptibility measurements. Below 268 K, a first-order phase transition occurs, leading to a low-temperature diamagnetic phase with TCNQ −• σ dimer…
Role of Alkyl Substituent and Solvent on the Structural, Thermal, and Magnetic Properties of Binary Radical Salts of 1,2,3,5-Dithia- or Diselenadiazolyl Cations and the TCNQ Anion
The synthesis, structural, thermal, and magnetic properties of a series of simple binary organic salts based on the radical anion of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 4-(N-alkylpyridinium-3-yl)-1,2,3,5-dithiadiazolyl (DTDA), 1R (R = Et, Pr, Bu), radical cations and their heavier selenium analogues (DSDA), 2R, are described. Single-crystal X-ray structural analyses reveal that short alkyl substituents on the pyridinium moiety of DTDA/DSDA cations lead to crystallization of isostructural acetonitrile (MeCN) solvates 1Et·MeCN, 1Pr·MeCN, 2Et·MeCN, and 2Pr·MeCN with trans-cofacial DTDA radical cation and eclipsed-cofacial TCNQ radical anion dimers. A slight increase in the substituent …
Coordination Complexes of a Neutral 1,2,4-Benzotriazinyl Radical Ligand: Synthesis, Molecular and Electronic Structures, andMagnetic Properties
A series of d-block metal complexes of the recently reported coordinating neutral radical ligand 1-phenyl-3-(pyrid-2-yl)-1,4-dihydro-1,2,4-benzotriazin-4-yl (1) was synthesized. The investigated systems contain the benzotriazinyl radical 1 coordinated to a divalent metal cation, MnII, FeII, CoII, or NiII, with 1,1,1,5,5,5-hexafluoroacetylacetonato (hfac) as the auxiliary ligand of choice. The synthesized complexes were fully characterized by single-crystal X-ray diffraction, magnetic susceptibility measurements, and electronic structure calculations. The complexes [Mn(1)(hfac)2] and [Fe(1)(hfac)2] displayed antiferromagnetic coupling between the unpaired electrons of the ligand and the meta…
Coexistence of long-range antiferromagnetic order and slow relaxation of the magnetization in the first lanthanide complex of a 1,2,4-benzotriazinyl radical
The first lanthanide complex of a 1,2,4-benzotriazinyl radical (1), Dy(1)(tbacac)3 (2, tbacac = 2,2,6,6-tetramethyl-3,5-heptane-dionato), was synthesised and found to have an antiferromagnetically ordered ground state with a metamagnetic phase diagram and a critical field of 0.91 T at 1.85 K. The application of a small dc field revealed the single-molecule magnet behaviour of 2, illustrating the coexistence of long-range antiferromagnetic order and slow relaxation of the magnetization. peerReviewed
Metal-organic magnets with large coercivity and ordering temperatures up to 242°C.
International audience; Magnets derived from inorganic materials (e.g., oxides, rare-earth–based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic magnets suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of light…
CCDC 1057508: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Georgia A. Zissimou, Panayiotis A. Koutentis, Mathieu Rouzières, Rodolphe Clérac and Heikki M. Tuononen|2015|Chem.-Eur.J.|21|15843|doi:10.1002/chem.201501343
CCDC 1057512: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Georgia A. Zissimou, Panayiotis A. Koutentis, Mathieu Rouzières, Rodolphe Clérac and Heikki M. Tuononen|2015|Chem.-Eur.J.|21|15843|doi:10.1002/chem.201501343
CCDC 1983877: Experimental Crystal Structure Determination
Related Article: Panagiota Perlepe, Itziar Oyarzabal, Aaron Mailman, Morgane Yquel, Mikhail Platunov, Iurii Dovgaliuk, Mathieu Rouzières, Philippe Négrier, Denise Mondieig, Elizaveta A. Suturina, Marie-Anne Dourges, Sébastien Bonhommeau, Rebecca A. Musgrave, Kasper S. Pedersen, Dmitry Chernyshov, Fabrice Wilhelm, Andrei Rogalev, Corine Mathonière, Rodolphe Clérac|2020|Science|6516|587|doi:10.1126/science.abb3861
CCDC 1057511: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Georgia A. Zissimou, Panayiotis A. Koutentis, Mathieu Rouzières, Rodolphe Clérac and Heikki M. Tuononen|2015|Chem.-Eur.J.|21|15843|doi:10.1002/chem.201501343
CCDC 1057510: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Georgia A. Zissimou, Panayiotis A. Koutentis, Mathieu Rouzières, Rodolphe Clérac and Heikki M. Tuononen|2015|Chem.-Eur.J.|21|15843|doi:10.1002/chem.201501343
CCDC 1057507: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Georgia A. Zissimou, Panayiotis A. Koutentis, Mathieu Rouzières, Rodolphe Clérac and Heikki M. Tuononen|2015|Chem.-Eur.J.|21|15843|doi:10.1002/chem.201501343
CCDC 1057506: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Georgia A. Zissimou, Panayiotis A. Koutentis, Mathieu Rouzières, Rodolphe Clérac and Heikki M. Tuononen|2015|Chem.-Eur.J.|21|15843|doi:10.1002/chem.201501343
CCDC 2007863: Experimental Crystal Structure Determination
Related Article: Panagiota Perlepe, Itziar Oyarzabal, Aaron Mailman, Morgane Yquel, Mikhail Platunov, Iurii Dovgaliuk, Mathieu Rouzières, Philippe Négrier, Denise Mondieig, Elizaveta A. Suturina, Marie-Anne Dourges, Sébastien Bonhommeau, Rebecca A. Musgrave, Kasper S. Pedersen, Dmitry Chernyshov, Fabrice Wilhelm, Andrei Rogalev, Corine Mathonière, Rodolphe Clérac|2020|Science|6516|587|doi:10.1126/science.abb3861
CCDC 1563199: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Mathieu Rouzières, Rodolphe Clérac, Heikki M. Tuononen|2017|Dalton Trans.|46|12790|doi:10.1039/C7DT02766D
CCDC 1057509: Experimental Crystal Structure Determination
Related Article: Ian S. Morgan, Akseli Mansikkamäki, Georgia A. Zissimou, Panayiotis A. Koutentis, Mathieu Rouzières, Rodolphe Clérac and Heikki M. Tuononen|2015|Chem.-Eur.J.|21|15843|doi:10.1002/chem.201501343