117156-72-6

Upstream product

• 107907-69-7 hexafluorophosphate de 4,5-dimethyl-1,3-dithiolium-2-triphenylphosphonium 

Downstream Products

• 117156-71-5 C₂₅H₂₀PS₂⁽¹⁺⁾*F₆P^(1-) 
• 107907-49-3 1,3-dithiole 2-tripenylphosphonium hexafluorophosphanate 
• 107907-69-7 hexafluorophosphate de 4,5-dimethyl-1,3-dithiolium-2-triphenylphosphonium 
• 50708-37-7 tetramethyltetrathiafulvalene 
• 603-35-0 triphenylphosphine 
• 35079-58-4 Bis(cyclohexeno)tetrathiafulvalen 
• 65220-68-0 dimethyltetramethylenetetrathiafulvalene 

Relevant academic research and scientific papers

π Conjugation across the tetrathiafulvalene core: Synthesis of extended tetrathiafulvalene derivatives and theoretical analysis of their unusual electrochemical properties

A series of extended tetrathiafulvalene (TTF) derivatives bearing one or two 1,4-dithiafulven-6-yl substituents has been prepared. The new compounds present remarkable electrochemical singularities compared with other TTF derivatives, which are strongly affected by the nature of the substitution on the lateral heterocycle(s). This unusual electrochemical behaviour follows a square-scheme sequence and is attributed to structural changes upon oxidation of the π-donating molecules. Digital simulations of the electrochemical data have been used to reach the values of the kinetic and thermodynamic constants involved in the square scheme. Theoretical calculations establish an important contribution of a highly delocalised resonant form involving a tetravalent sulphur in oxidised species, which could justify the occurrence of an electrochemical behaviour distinct from that of TTF. Finally, third- order susceptibilities χ3 of two of these systems, for which electron- donating and electron-withdrawing substituents coexist and are conjugated through the TTF π system, are given.

Synthesis of unsimmetrically substituted tetrathiafulvalenes by the "ylid route". Investigations of selectivity.

The selective synthesis of unsimmetrically substituted tetrathiafulvalenes 1 (R R') using phosphonium ylids 2 and dithiolium salts 3 in THF at -80 deg C has been investigated.Several unsymmetrical tetrathiafulvalenes were obtained in good yield. R,R'=CH3; (CH2)4; o-C6H4.It was also shown that the instability of the phosphonium ylid 2 and dithiolylium 3 under the rreaction conditions leads to the formation of variable amounts of symmetrical terathiafulvalenes 1 (R = R').Therefore, purification of the mixture by column chromatography with CS2 as eluent was necessary.

NEW CONDUCTING SALTS CONTAINING UNSYMMETRICAL ?-DONORS

This communication describes the synthesis and the electrochemical properties of a new type of donor containing sulfur or selenium atoms: the dimethyltetramethylenetetraselenafulvalene 1 and the dimethyltetramethylenetetrathiafulvalene 2.The electrical conductivity of their charge transfer complexes and of some of their radical cation salts are reported.