Title: New superconducting charge-transfer salts (-)<sub>4</sub>[·(<sub>2</sub><sub>4</sub>)<sub>3</sub>]·<sub>6</sub><sub>5</sub><sub>2</sub>( =<sub>3</sub>or<sub>4</sub>, = or , - = )
Abstract: Molecules into Materials, pp. 559-565 (2007) No AccessNew superconducting charge-transfer salts (BEDT-TTF)4[A·M(C2O4)3]·C6H5NO2 (A = H3O or NH4, M = Cr or Fe, BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene)Samina Rashid, Scott S. Turner, Peter Day, Judith A. K. Howard, Philippe Guionneau, Eric J. L. McInnes, Frank E. Mabbs, Robin J. H. Clark, Steven Firth, and Tim BiggsSamina RashidDavy–Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London, UK W1X 4BS, UK, Scott S. TurnerDavy–Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London, UK W1X 4BS, UK, Peter DayDavy–Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London, UK W1X 4BS, UK, Judith A. K. HowardDepartment of Chemistry, University of Durham, Durham, UK DH1 3LE, UK, Philippe GuionneauDepartment of Chemistry, University of Durham, Durham, UK DH1 3LE, UK, Eric J. L. McInnesChemistry Department, University of Manchester, Oxford Road, Manchester, UK M13 9PL, UK, Frank E. MabbsChemistry Department, University of Manchester, Oxford Road, Manchester, UK M13 9PL, UK, Robin J. H. ClarkChristopher Ingold Laboratories, University College, 20 Gordon Street, London, UK WC1H 0AJ, UK, Steven FirthChristopher Ingold Laboratories, University College, 20 Gordon Street, London, UK WC1H 0AJ, UK, and Tim BiggsClarendon Laboratory, Oxford, Oxford University, Parks Road, Oxford, UK OX1 3PU, UKhttps://doi.org/10.1142/9789812706836_0043Cited by:0 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: The syntheses, crystal structures, and physical properties of two new crystalline charge-transfer salts of BEDT-TTF, bis(ethylenedithio)tetrathiafulvalene, containing tris(oxalato)metallate(III) anions of 3d elements are reported. Electrochemical oxidation of BEDT-TTF in the presence of (NH4)3[Fe(C2O4)3]·3H2O or (NH4)3[Cr(C2O4)3]·3H2O in C6H5NO2, yields crystals of β″-(BEDT-TTF)4[A·Fe(C2O4)3]·C6H5NO2 [1] or β″-(BEDT-TTF)4[A·Cr(C2O4)3]·C6H5NO2 [2] (A = H3O+ or NH4+). The crystal structure of [1] has been solved at 120 K in the monoclinic space group C2/c, and that of [2] in the same space group at 298 and 120 K. For [1], a = 10.273 Å, b = 19.949 Å, c = 35.030 Å, β = 92.97°, V=7169.6(2) Å3, Z=8. For [2], at 298 K: a= 10.304 Å, b = 20.091 Å, c=35.251 Å, β = 92.70°, V= 7289.3(2) Å3, Z=8, and at 120 K a= 10.283 Å, b = 19.917 Å, c = 34.939 Å, β = 93.30°, V= 7144.4(1) Å3, Z=8. The crystal structures of both compounds consist of alternating layers of BEDT-TTF cations and layers containing [M(C2O4)3]3−, H3O+ or NH4+, and PhNO2. The BEDT-TTF molecules are arranged in the β″ packing motif and the tris(oxalato)metallate(III) ions form the well-known honeycomb motif found in many molecular based magnets. SQUID magnetometry, Raman spectroscopy and electron paramagnetic resonance (EPR) measurements were performed on crystals of [1]. SQUID magnetometry, single-crystal four-probe conductivity measurements, Raman spectroscopy, EPR and polarised infrared reflectance were performed on crystals of [2]. Both compounds have metal to superconducting transitions with Tc = 6.2K for [1] and for [2], Tc = 5.8 K. FiguresReferencesRelatedDetails Molecules into MaterialsMetrics History PDF download
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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