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Charge transfer salt with substituted Lindquist polyoxometalate: Synthesis, crystal structure, and physical properties of α-(BEDT-TTF) 6(VW5O19·DMF·2H2O

Abstract : A new charge transfer salt based on bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and the vanadium substituted Lindquist anion [VW5O 19]3- was synthesized and characterized by X-ray and spectroscopic analysis. Monoclinic, C2, Fw = 3789.2, a = 41.5019(5), b = 11.2600(2), c = 12.7514(2) Å β = 101.877(5)°, Z = 2, R = 0.060, based on 12095 reflections with I > 2σ(I). The structure consists of alternating organic and inorganic layers. The inorganic layer is generated by [VW5O19]3- anions, dimethylformamide (DMF) and water molecules. The organic layer, which is generated by three different BEDT-TTF units, belongs to the α-type of packing and consists of trimerized chains parallel to the c direction. The compound is a semi-conductor with σ300K = 1.1 S·cm -1 and Ea = 0.1 eV. Polarized reflectance spectra of single crystals were measured over the spectral range from 650 to 25000 cm -1. FT-NIR Raman spectra of powdered crystals dispersed in KBr pellets were also recorded. Vibrational and electronic features are discussed.
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https://hal.univ-brest.fr/hal-01771325
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Submitted on : Thursday, April 19, 2018 - 2:47:29 PM
Last modification on : Thursday, November 29, 2018 - 4:09:12 PM

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L. Ouahab, S. Golhen, Smail Triki, A. Łapiński, M. Golub, et al.. Charge transfer salt with substituted Lindquist polyoxometalate: Synthesis, crystal structure, and physical properties of α-(BEDT-TTF) 6(VW5O19·DMF·2H2O. Journal of Cluster Science, 2002, Unknown, Unknown Region. pp.267--278, ⟨10.1023/A:1020538613351⟩. ⟨hal-01771325⟩

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