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Article Dans Une Revue Journal of Materials Chemistry Année : 2011

Probing magnetic interactions in columnar phases of a paramagnetic gold dithiolene complex

Résumé

A novel radical gold dithiolene complex exhibits a hexagonal columnar mesophase, as confirmed by optical microscopy , DSC analysis and X-ray diffraction . The extent of delocalization of the spin density in such a complex was analyzed by EPR . Temperature dependent magnetization measurements reveal that the global magnetic moment is remarkably affected at the liquid-crystalline phase transition with a marked hysteresis signature, rare behavior among the few described paramagnetic discotic phases. In addition, these molecules were found to strongly aggregate in solution into one-dimensional fibers with a mean diameter of 60 nm extending over micrometres, leading to the formation of gel-like structures. These fibers are stable and can be isolated on surfaces. The gelation of the system can also be detected by temperature-dependent magnetic measurements.

Domaines

Chimie organique
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Dates et versions

hal-00601702 , version 1 (15-07-2013)

Identifiants

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Romain Perochon, Patrick Davidson, Stéphan Rouziere, Franck Camerel, Lidia Piekara-Sady, et al.. Probing magnetic interactions in columnar phases of a paramagnetic gold dithiolene complex. Journal of Materials Chemistry, 2011, 21, pp.1416-1422. ⟨10.1039/c0jm02171g⟩. ⟨hal-00601702⟩
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