An original supramolecular helicate from a bipyridine-bipyrazine ligand strand and Ni-II by self-assembly

Bernard Fraisse; Noureddine Ghermani; J. Mathieu; D. Lacour; F. Montaigne; A. Marsura

hal-00133316, version 1

An original supramolecular helicate from a bipyridine-bipyrazine ligand strand and Ni-II by self-assembly

Bernard Fraisse ¹, Noureddine Ghermani ^1, 2, J. Mathieu ³, D. Lacour ⁴, F. Montaigne ⁴, A. Marsura ³

European Journal of Inorganic Chemistry (2006) 133-136

Résumé : A new discrete supramolecular pseudo-helicate has been obtained from a saturated heterotopic methylbipyrazyl-methylbipyridyl ligand strand and NiCl2. The X-ray structure of the dinuclear complex shows the 2-oxapropylene bridge oxygen atoms are engaged in coordination to the octahedral metal centre and a selective ligand inter-strand orientation is promoted in the complex. The crystal packing shows a perfect regular linear arrangement of the asymmetric units giving a packing of interacting molecules having well-defined rectangular and polygonal open channels. Although a paramagnetic behaviour is observed above 10 K, below this temperature a significant deviation of this behaviour suggests the presence of an Ni-II-Ni-II magnetic coupling.

1 : Laboratoire Structures, Propriétés et Modélisation des solides (SPMS)
CNRS : UMR8580 – Ecole Centrale Paris
2 : Physico-chimie, pharmacotechnie, biopharmacie (PCPB)
CNRS : UMR8612 – Université Paris XI - Paris Sud
3 : Structure et Réactivité des Systèmes Moléculaires Complexes (SRSMC)
CNRS : UMR7565 – Université Henri Poincaré - Nancy I
4 : Laboratoire de physique des matériaux (LPM)
CNRS : UMR7556 – Université Henri Poincaré - Nancy I – Institut National Polytechnique de Lorraine (INPL)

hal-00133316, version 1
http://hal.archives-ouvertes.fr/hal-00133316
oai:hal.archives-ouvertes.fr:hal-00133316
Contributeur : Oualid Jouini <>
Soumis le : Dimanche 25 Février 2007, 16:43:59
Dernière modification le : Mercredi 10 Septembre 2008, 10:33:08

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DOI : 10.1002/ejic.200500660

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