Showing papers by "Philippe Guionneau published in 2001"
TL;DR: In this paper, bimetallic extended networks built from WIV(CN)8−4− and M2+=FeII, CuII, denoted hereafter as FeW for FeII−2[WIV[CN]8]·8H2O and Cu ǫ-W for CuII-2]·5H 2O were solved in the tetragonal system for M=Fe, and consisted of a three-dimensional (3D) structure with alternating W(CN), 8 and Fe(H 2 O)2 units leading
68 citations
TL;DR: In this article, the crystal structures at 30 K of two iron(II) complexes were compared with higher temperature crystal structures, and it was shown that, outside of the spin transition range, the only intramolecular modification comes from dynamical aspects.
Abstract: The crystal structures at 30 K of two iron(II) complexes, and their comparison with higher temperature crystal structures indicate that, outside of the spin transition range, the only intramolecular modification comes from dynamical aspects. The contraction of the packing is strong from 110 to 30 K and similar in both complexes. The high pressure (0.16 GPa, 0.40 GPa) crystal structures of another iron(II) complex of the same family show that strong changes are induced under pressure within the packing but that, to a first approximation, the effects of temperature (11 K) or pressure (0.40 GPa) on the intermolecular contacts are very similar even though one S···C intermolecular contact is significantly different. Moreover, slight differences in the cell parameter changes are noted. We also show that the deformation of the iron(II) coordination sphere does not depend on the applied constraint but on the spin state only.
29 citations
TL;DR: In this paper, the preparation, crystal structures and properties of three new BEDT-TTF, bis(ethylenedithio)tetrathiafulvalene, (ET for short), charge transfer salts beta " (ET)(4).
6 citations
TL;DR: A series of adducts formed by association of the uranyl ion, UO 22+, with either nitronyl nitroxide substituted pyridine andtriazole ligands or their imino-nogroxide counterpart are described in this paper.
6 citations
TL;DR: In this article, the crystal structures of BETS molecules were determined by X-ray diffraction methods, and the structures of 1, 2, and 3 were characterized by strong disorder of their respective anions.
Abstract: κ-(BETS) 8 (Cu 2 Cl 6 )(CuCl 4 ) ( 1 ), θ-(BETS) 2 (CuCl 2 ) ( 2 ), (BETS) 2 (CuCl 4 ) ( 3 ) (BETS = bis(ethylenedithio)tetraselenafulvalene) have been prepared by diffusion-electrocrystallisation of BETS and (AsPh 4 ) 2 (Cu 2 Cl 6 ) solutions in chlorobenzene–ethanol. 2 has also been obtained by simple diffusion of BETS and (AsPh 4 ) 2 (Cu 2 Cl 6 ) solutions. 1 and 2 exhibit metal-like behaviour, down to 40 K for 1 and 4 K for 2 . 3 behaves as an insulator. The crystal structures of 1 , 2 , and 3 are determined by X-ray diffraction methods. The structures of 1 (at 140 and 25 K) and 2 are characterised by a strong disorder of their respective anions. The crystal structure of 3 shows an unusual packing of the BETS molecules, consisting of slipped stacked (BETS) 2 dimers, leading to insulating properties. Based on the structures of 1 (at 140 and 25 K), 2 and 3 , molecular and band structure calculations are carried out for the interpretation of the physical behaviours of these phases.
1 citations