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Comptes Rendus Chimie
Volume 15, n° 10
pages 889-894 (octobre 2012)
Doi : 10.1016/j.crci.2012.04.003
Received : 25 February 2012 ;  accepted : 10 April 2012
Hexanuclear manganese(III) single-molecule magnets from derivatized salicylamidoximes
 

José Martínez-Lillo a , Lise-Marie Chamoreau a , Anna Proust a, b , Michel Verdaguer a, , Pierre Gouzerh a,
a Institut parisien de chimie moléculaire, UMR CNRS 7201, case courrier 42, université Pierre et Marie Curie Paris 6, 4, place Jussieu, 75252 Paris cedex 05, France 
b Institut universitaire de France, 75005 Paris, France 

Corresponding authors.
Abstract

Four novel hexanuclear manganese(III) complexes based on derivatized salicylamidoximes, [MnIII63 -O)2 (O2 CPh)2 (Me2 N-sao)6 (EtOH)4 ] (1), [MnIII63 -O)2 (O2 CPh)2 (Me2 N-sao)6 (iPrOH)4 ] (2), [MnIII63 -O)2 (O2 CPh)2 (Et2 N-sao)6 (EtOH)4 ] (3) and [MnIII63 -O)2 (O2 CPh)2 (Et2 N-sao)6 (iPrOH)4 ] (4) (Me2 N-Hsao=dimethylsalicylamidoxime; Et2 N-Hsao=diethylsalicylamidoxime), have been prepared and characterized. Single-crystal X-ray diffraction allows one to determine that 1·2CHCl3 and 4 crystallize in the triclinic system with space group P (–1), whereas 3 crystallizes in the monoclinic system with space group P 21 /n . dc and ac magnetic susceptibility measurements of 1-4 reveal ferromagnetic coupling between Mn(III) metal ions and single-molecule magnet behaviour. The anisotropy barriers are 56, 52, 71 and 59K for 1, 2, 3 and 4, respectively.

The full text of this article is available in PDF format.
Résumé

Quatre nouveaux complexes hexanucléaires de manganèse(III) dérivés de salicylamidoximes substituées, [MnIII63 -O)2 (O2 CPh)2 (Me2 N-sao)6 (EtOH)4 ] (1), [MnIII63 -O)2 (O2 CPh)2 (Me2 N-sao)6 (iPrOH)4 ] (2), [MnIII63 -O)2 (O2 CPh)2 (Et2 N-sao)6 (EtOH)4 ] (3) et [MnIII63 -O)2 (O2 CPh)2 (Et2 N-sao)6 (iPrOH)4 ] (4) (Me2 N-Hsao=diméthylsalicylamidoxime; Et2 N-Hsao=diéthylsalicylamidoxime), ont été préparés et caractérisés. La diffraction des rayons X sur monocristal montre que 1·2CHCl3  et 4 cristallisent dans le système triclinique, groupe d’espace P (–1), tandis que 3 cristallise dans le système monoclinique, groupe d’espace P 21 /n . La susceptibilité magnétique dc et ac de 14 révèle un couplage ferromagnétique entre ions Mn(III) et un comportement de molécule-aimant. Les barrières d’anisotropie sont respectivement de 56, 52, 71 et 59K pour 1, 2, 3 and 4.

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Keywords : Manganese(III) complexes, Salicylamidoximes, Crystal structures, Magnetic properties, Single-molecule magnets

Mots clés : Complexes de manganèse(III), Salicylamidoximes, Structures cristallines, Propriétés magnétiques, Molécules-aimants




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