Tetramethyltetraselenafulvalene

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Structural formula
Structural formula of tetramethyltetraselenafulvalene
General
Surname Tetramethyltetraselenafulvalene
Molecular formula C 10 H 12 Se 4
External identifiers / databases
CAS number 55259-49-9
EC number 623-491-9
ECHA InfoCard 100.152.166
PubChem 143265
ChemSpider 126388
Wikidata Q27116206
properties
Molar mass 448.04 g mol −1
Physical state

firmly

Melting point

273–275 ° C (decomposition)

safety instructions
GHS labeling of hazardous substances
06 - Toxic or very toxic 08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 301-331-373-410
P: 261-273-301 + 310-311-501
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

  1. ↑ a b c data sheet tetramethyltetraselenafulvalene, 97% from Sigma-Aldrich , accessed on October 4, 2016 ( PDF ).
  2. ↑ Michael Bockshecker: Chalcogenanthrenes and transition metal halides - complex formation and redox reactions. (PDF) June 2015, p. 4 , accessed on January 4, 2017 .
  3. ↑ 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 .
  4. ↑ Entry on superconductivity. In: Römpp Online . Georg Thieme Verlag, accessed on October 5, 2016.