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Issue 25, 2007
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Ferromagnetic interactions in Ru(III)–nitronyl nitroxide radical complex: a potential 2p4d building block for molecular magnets

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Abstract

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 π-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.

Graphical abstract: Ferromagnetic interactions in Ru(iii)–nitronyl nitroxide radical complex: a potential 2p4d building block for molecular magnets

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Publication details

The article was received on 02 Feb 2007, accepted on 17 Apr 2007 and first published on 30 Apr 2007


Article type: Paper
DOI: 10.1039/B701657C
Citation: Dalton Trans., 2007,0, 2689-2695

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

    F. Pointillart, K. Bernot, L. Sorace, R. Sessoli and D. Gatteschi, Dalton Trans., 2007, 0, 2689
    DOI: 10.1039/B701657C

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