J. Phys. IV France
Volume 114, April 2004
Page(s) 577 - 579

J. Phys. IV France
114 (2004) 577
DOI: 10.1051/jp4:2004114137

[BETS] $\mathsf{_{2}}$ $\cdot{ C_{60 }}$ complex and BETS salts with square-planar platinate (II), nickelate (II) anions: (BETS) 4 ${\cdot} $Pt(CN) 4, (BETS) 4 ${\cdot} $Ni(CN) 4

N. Spitsina1, 1, A. Dubrovskii1, L. Buravov1, G. Shilov1, O. Dyachenko1, Y. Okano2 and A. Kobayashi3

1  Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, MD, Russia
2  Institute for Molecular Science, Okazaki 444-8585, Japan
3  Research Center for Spectrochemistry, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

The (BETS) $_{2}\cdot $C 60 complex (1) and new radical cation salts based on bis(ethylenedithio)tetraselenafulvalene (BETS) with the square-planar [ Ni(CN) 4] 2- , [ Pt(CN) 4] 2- anions were synthesized: (BETS) $_{4}\cdot $Ni(CN) 4 (2), (BETS) $_{4}\cdot $ Pt(CN) 4 (3). The crystal structure of 1 - 3 is layered. The layers consisting of C 60 molecules are alternated with the layers composed of BETS molecules in 1. The obtained complex is classified as molecular adduct in which the van der Waals interactions are predominant. The radical cation layers in the salt 2 are alternated with the anion layers along the ñ-direction of the unit cell. The salts retain metallic state down to 4.2 K. The band structure calculation of 2 shows 2-dimensional cylindrical Fermi surface, which is consistent with the $\theta $- type structure and its conductivity. Key words. Radical cation salts, bis(ethylenedithio)tetraselenafulvalene, tetracyanonickelate (II) anion, tetracyanoplatinate (II) anion, fullerene, crystal structure, electronic band structure calculation.

© EDP Sciences 2004