Some new radical-cation salts based on unsymmetrical tetraheterofulvalenes: (MDTTTF)4Pt(CN)4, the first κ-phase salt, with a square planar dianion
1992; Elsevier BV; Volume: 48; Issue: 2 Linguagem: Inglês
10.1016/0379-6779(92)90063-o
ISSN1879-3290
AutoresG.A. Mousdis, Laurent Ducasse, Mohammed Fettouhi, Lahcène Ouahab, E. Dupart, Chantal Garrigou–Lagrange, J. Amiell, R. Canet, P. Delhaès,
Tópico(s)Quantum and electron transport phenomena
ResumoWe report the synthesis of the organic donor radical cations, methylenedithiotetrathiafulvalene (MDTTTF), ethylenedithiotetrathiafulvalene (EDTTTF) and vinylenedithiotetrathiafulvalene (VDTTTF), with the square planar dianions, Pt(CN)4 and Ni(CN)4. Among these salts, the κ-(MDTTTF)4Pt(CN)4 (CH2Cl2) phase constitutes the first κ-phase, produced with a nonlinear dianion. Crystal and electronic structures, electrical and optical properties and ESR measurements have been investigated for these salts. Crystal and electronic structures of κ-(MDTTTF)4Pt(CN)4 are similar to those of (MDTTTF)2AuI2, which is an ambient pressure superconductor (Tc = 4.5 K). However, d.c. conductivity measurements show a semiconducting behaviour, associated with an ESR linewidth decreasing with temperature in contrast with all other known κ salts. An explanation of the origin of these different behaviours is proposed.
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