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Article Dans Une Revue Dalton Transactions Année : 2007

Ferromagnetic interactions in Ru(lll)-nitronyl nitroxide radical complex : a potential 2p4d building block for molecular magnets

Résumé

The reaction between [Ru(salen)(PPh3)Cl] and the 4-pyridyl-substituted nitronyl nitroxide radical (NITpPy) leads to the [Ru(salen)(PPh3)(NITpPy)](ClO4)(H2O)21 complex while the reaction with the azido anion (N3-) leads to the [Ru(salen)(PPh3)(N3)] 2 complex (where salen2- = N,N-ethan-1,2-diylbis(salicylidenamine) and PPh3 = triphenylphosphine). Both compounds have been characterized by single crystal X-ray diffraction. The two crystal structures are composed by a [Ru(III)(salen)(PPh3)]+ unit where the Ru(III) ion is coordinated to a salen2- ligand and one PPh3 ligand in axial position. In 1 the Ru(III) ion is coordinated to the 4-pyridyl-substituted nitronyl nitroxide radical whereas in 2 the second axial position is occupied by the azido ligand. In both complexes the Ru(III) ions are in the same environment RuO2N3P, in a tetragonally elongated octhaedral geometry. The crystal packing of 1 reveals -stacking in pairs. While antiferromagnetic intermolecular interaction (J2 = 5.0 cm-1) dominates at low temperatures, ferromagnetic intramolecular interaction (J1 = -9.0 cm-1) have been found between the Ru(III) ion and the coordinated NITpPy.
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Dates et versions

hal-00525266 , version 1 (11-10-2010)

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  • HAL Id : hal-00525266 , version 1

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Kevin Bernot, Dante Gatteschi, Fabrice Pointillart, Roberta Sessoli, L. Sorace. Ferromagnetic interactions in Ru(lll)-nitronyl nitroxide radical complex : a potential 2p4d building block for molecular magnets. Dalton Transactions, 2007, pp.2689-2695. ⟨hal-00525266⟩
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