Tetramethyltetraselenafulvalene
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Tetramethyltetraselenafulvalene | ||||||||||||||||||
Molecular formula | C 10 H 12 Se 4 | ||||||||||||||||||
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properties | |||||||||||||||||||
Molar mass | 448.04 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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Melting point |
273–275 ° C (decomposition) |
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Tetramethyltetraselenofulvalene (TMTSF) is a chemical compound from the group of organoselenium compounds and heterofulvalene .
Manufacturing
Tetramethyltetraselenafulvalene can by the substitution of the hydrogen atoms of the Tetraselenafulvalens by methyl groups are obtained.
Superconductivity
Tetramethyltetraselenofulvalene salts of the (TMTSF) 2 X type (with X = single negatively charged anion) have a high electrical conductivity, the hexafluorophosphate from TMTSF was the first organic superconductor ( Bechgaard salt ). This salt only becomes superconducting at high pressure (12 kbar at 0.9 Kelvin ). The perchlorate (TMTSF) 2 ClO 4, on the other hand, becomes superconducting at 1.2 K even at normal pressure. In the conductive complexes, the organic cations are stacked like a sandwich.
Individual evidence
- ↑ a b c data sheet tetramethyltetraselenafulvalene, 97% from Sigma-Aldrich , accessed on October 4, 2016 ( PDF ).
- ↑ Michael Bockshecker: Chalcogenanthrenes and transition metal halides - complex formation and redox reactions. (PDF) June 2015, p. 4 , accessed on January 4, 2017 .
- ↑ D. Jérome , A. Mazaud, M. Ribault, K. Bechgaard : Superconductivity in a synthetic organic conductor (TMTSF) 2 PF 6 . In: Journal de Physique Lettres . tape 41 , no. 4 , 1980, p. 95-98 , doi : 10.1051 / jphyslet: 0198000410409500 .
- ↑ Entry on superconductivity. In: Römpp Online . Georg Thieme Verlag, accessed on October 5, 2016.