Toward molecular magnets: the metal-radical approach

Caneschi, Andrea; Gatteschi, Dante; Sessoli, Roberta; Rey, P.

doi:10.1021/ar00167a004

Cited by 848 publications

(424 citation statements)

References 64 publications

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“…One possible technique is to utilize the metalradical approach in which organic radical ligands are used to mediate the magnetic coupling between paramagnetic metal centers. 1 While there exists a plethora of open shell ligands that can coordinate to metals (e.g. semiquinones, 2,3 nitroxides, 4 thiazyls, 5,6 and verdazyls 7,8 ), many of them are not air and moisture stable, and hence, cannot be used as building blocks for practical magnetic materials.…”

mentioning

confidence: 99%

1-Phenyl-3-(pyrid-2-yl)benzo[e][1,2,4]triazinyl: The First “Blatter Radical” for Coordination Chemistry

et al. 2013

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A neutral air-and moisture-stable N,N′chelating radical ligand, 1-phenyl-3-(pyrid-2-yl)benzo[e]-[1,2,4]triazinyl (1) was synthesized and characterized by electron paramagnetic resonance spectroscopy, X-ray crystallography, and magnetic measurements. Subsequent reaction of 1 with Cu(hfac) 2 •2H 2 O (hfac = hexafluoroacetylacetonate) under ambient conditions afforded the coordination complex Cu(1)(hfac) 2 in which the radical binds to the metal in a bidentate fashion. Magnetic susceptibility data collected from 1.8 to 300 K indicate a strong ferromagnetic metal-radical interaction in the complex and weak antiferromagnetic radical•••radical interactions between the Cu(1)(hfac) 2 units. Detailed computational investigations support this assignment. Radical 1 is a new addition to the growing library of 1,2,4-triazinyl radicals and the first member of this family of paramagnetic species synthesized specifically for coordination purposes.

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confidence: 99%

1-Phenyl-3-(pyrid-2-yl)benzo[e][1,2,4]triazinyl: The First “Blatter Radical” for Coordination Chemistry

et al. 2013

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“…This obtained parameter value are comparatively close to the previously reported for a similar compound with different substituents attached to the radical ring, and these parameters are listed in the Table 4. This ferromagnetic coupling between the radical and the Cu(hfac) 2 probably attribute to that the π* orbital of the radical oxygen and nitrogen is nearly orthogonal to the magnetic 2 2 3d x y -orbital of the copper atom. 17 …”

Section: Magnetic Propertiesmentioning

confidence: 96%

“…51.4 mg (0.1 mmol) of Cu(hfac) 2 •2H 2 O was dissolved in 20 mL of boiling n-heptane and this light blue-green transparent solution was refluxed for 2 h. When the solution was cooled to about 60 ℃, 24.0 mg (0.05 mmol) of 1 was added under stirring and followed by 10 mL of CH 2 Cl 2 . After stirred for an additional 1 h, the final dark green solution was allowed to cool, filtered and was kept at 4 for …”

Section: Preparation Of the Copper Complex (2)mentioning

confidence: 99%

A Ladder‐like One‐dimensional Chain Based on a New Biradical and Cu^II: Crystal Structure and Magnetic Properties

Wang

Yang

et al. 2010

Chin. J. Chem.

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A new biradical di(4-(1'-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4',5'-dihydro-1'H-imidazol-2'-yl)phenyl) ether (1) and its copper complex 2 were synthesized and characterized structurally. The X-ray structure determination revealed that, the complex is in the triclinic P-1 space group and displays a ladder-like structure. Each copper atom is surrounded by four oxygen atoms from hexafluoroacetylacetone and two oxygen atoms from biradical. The magnetic measurements show that biradical 1 exhibits a weak intramolecular nitroxide-nitroxide antiferromagnetic coupling and copper complex 2 possesses weak ferromagnetic coupling (J＝5.09 cm -1 ) between Cu II and radical, which attributed to interaction between copper spin and the axially coordinated nitronyl nitroxide spin.

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“…The design and synthesis molecular-based magnetic materials by using metalradical approach have become one of the very promising strategies [2]. The organic radicals can act as not only spin carriers but also building blocks.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a ladder-like structure compound formed by cadmium (II) and anionic nitronyl nitroxide

Chen¹,

Zhang²,

Huang³

et al. 2013

OJIC

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Toward molecular magnets: the metal-radical approach

Cited by 848 publications

References 64 publications

1-Phenyl-3-(pyrid-2-yl)benzo[e][1,2,4]triazinyl: The First “Blatter Radical” for Coordination Chemistry

1-Phenyl-3-(pyrid-2-yl)benzo[e][1,2,4]triazinyl: The First “Blatter Radical” for Coordination Chemistry

A Ladder‐like One‐dimensional Chain Based on a New Biradical and Cu^II: Crystal Structure and Magnetic Properties

Synthesis and characterization of a ladder-like structure compound formed by cadmium (II) and anionic nitronyl nitroxide

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Toward molecular magnets: the metal-radical approach

Cited by 848 publications

References 64 publications

1-Phenyl-3-(pyrid-2-yl)benzo[e][1,2,4]triazinyl: The First “Blatter Radical” for Coordination Chemistry

1-Phenyl-3-(pyrid-2-yl)benzo[e][1,2,4]triazinyl: The First “Blatter Radical” for Coordination Chemistry

A Ladder‐like One‐dimensional Chain Based on a New Biradical and CuII: Crystal Structure and Magnetic Properties

Synthesis and characterization of a ladder-like structure compound formed by cadmium (II) and anionic nitronyl nitroxide

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A Ladder‐like One‐dimensional Chain Based on a New Biradical and Cu^II: Crystal Structure and Magnetic Properties