J. Phys. IV France
Volume 10, Numéro PR3, March 2000
Organic Superconductivity "20th Anniversary"
Page(s) Pr3-35 - Pr3-40
Organic Superconductivity "20th Anniversary"

J. Phys. IV France 10 (2000) Pr3-35-Pr3-40

DOI: 10.1051/jp4:2000304

Molecular materials based upon organic π-donors and magnetic anions

S. Triki1, F. Bérézovsky1, J. Sala Pala1, C.J. Gómez-García2 and E. Coronado2

1  UMR CNRS 6521 "Chimie, Electrochimie Moléculaires et Chimie Analytique", Université de Bretagne Occidentale, BP. 809, 29285 Brest Cedex, France
2  Departamento de Química Inorgánica, Universidad de Valencia, Dr. Moliner 50, 46100 Burjasot, Spain

Electrochemical combination of the magnetic dinuclear anion [MM'(C2O4)(NCS)8]4- (MM' = CrCr, CrFe) or paramagnetic mononuclear anion [Cr(NCS)6]3- with the ET organic π-donor (ET = BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene) gives rise to two new series of molecular hybrid salts formulated (ET)5[MM'(C2O4)(NCS)8] (MM' = CrCr (1), CrFe (2)), (ET)8[MM'(C2O4)(NCS)8] (3), (ET)5.5[Cr(NCS)6] (4) and (ET)5[(C2H)4N][Cr(NCS)6](THF) (5) (THF = tetrahydrofuran). The crystal structures consist of alternating organic and inorganic layers. The organic part does not 5produce any detectable effect on the magnetic properties coming from the inorganic sublattice. They indicate the presence of antiferromagnetic coupling in the homometallic dimers (1 and 3), while the coupling is ferromagnetic in the heterometallic one (2). Conductivity measurements reveal a metallic state for compounds 3 and 5.

© EDP Sciences 2000