Please use this identifier to cite or link to this item:
http://dx.doi.org/10.18419/opus-7656
Authors: | Gärtner, Stephan Heinen, Ilsabe Schweitzer, Dieter Nuber, Bernhard Keller, Heimo J. |
Title: | BEDT-TTF salts with square platinates(II) as counterions : [BEDT-TTF]4[Pt(C2O4)2], a new organic metal |
Issue Date: | 1989 |
metadata.ubs.publikation.typ: | Zeitschriftenartikel |
metadata.ubs.publikation.source: | Synthetic metals 31 (1989), S. 199-213 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-65213 http://elib.uni-stuttgart.de/handle/11682/7673 http://dx.doi.org/10.18419/opus-7656 |
Abstract: | The title compound, [BEDT-TTF]4[Pt(C2O4)2] is obtained by electrocrystallization, which yields black platelets of stoichiometry C44H32O8PtS32, Mr = 1909.87. Crystal structure determination at room temperature gives a triclinic cell Pi, with a = 8.678(2) A, b =11.878(5) A, c = 15.757(7) A,α = 105.49(3)°, β= 91.05(3)", 'γ= 91.96(3)", V = 1563.64 A3,d c = 2.03 g/cm 3, Z = 1. The solid contains sheets of BEDT-TTF cations separated by sheets of [Pt(C2O4)2]2-- counterions. The BEDT-TTF sheets are made up of columns that interact strongly through S-S contacts. The columns are built up by pairs of BEDT-TTF molecules. There are strongly varying bond distances in the two different BEDT-TTF moieties that make up a pair. This fact is especially clearly expressed in the surprisingly short C-C distances of the central C=C double bond of the two BEDT-TTF ions:1.273 A and 1.327 A respectively. These are by far the shortest distances for the central C=C bonds observed so far in conductive BEDT-TTF salts. The compound behaves like a metal down to about 60 K. Temperature-dependent d.c. conductivity, e.s.r. and thermopower measurements show metallic behaviour at room temperature (σ300 = 20 S/cm) with a metal-to-metal phase transition around 200 K. At about 60 K a second broad phase transition occurs and the crystals become semiconducting. |
Appears in Collections: | 15 Fakultätsübergreifend / Sonstige Einrichtung |
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schw133.pdf | 2,62 MB | Adobe PDF | View/Open |
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