Abstract
The syntheses of new BEDT-TTF derivatives are described. These comprise BEDT-TTF with one ethynyl group (HC≡C-), with two (n-heptyl) or four (n-butyl) alkyl side chains, with two trans acetal (-CH(OMe)2) groups, with two trans aminomethyl (-CH2NH2) groups, and with an iminodiacetate (-CH2N(CH2CO2−)2 side chain. Three transition metal salts have been prepared from the latter donor, and their magnetic properties are reported. Three tris-donor systems are reported bearing three BEDT-TTF derivatives with ester links to a core derived from benzene-1,3,5-tricarboxylic acid. The stereochemistry and molecular structure of the donors are discussed. X-ray crystal structures of two BEDT-TTF donors are reported: one with two CH(OMe)2 groups and with one a -CH2N(CH2CO2Me)2 side chain.
Highlights
IntroductionA very wide range of crystalline radical cation salts, with different stoichiometries, have been prepared, some of which are semi-conductors, conductors, or low temperature superconductors [1,2,3,4]
The development of conducting and hybrid materials is highly dependent on the availability of new donor systems, and such syntheses are often not straightforward
The trithione 10 does not react with all alkenes, and the presence of the BEDT-TTF unit can disrupt apparently standard synthetic manipulations to side chain functionalities
Summary
A very wide range of crystalline radical cation salts, with different stoichiometries, have been prepared, some of which are semi-conductors, conductors, or low temperature superconductors [1,2,3,4]. A range of different packing modes for the donors in these salts have been identified [5,6,7], which includes a κ-phase in the superconducting salts, such as (BEDT-TTF) Cu(NCS) , where the donors pack in face-to-face pairs but lie roughly perpendicular to their neighbouring pairs [8,9,10]. BEDT-TTF has been used to prepare hybrid materials with conducting and magnetic properties [11,12,13,14], as pioneered initially by Day et al who prepared salts with iron tris(oxalate) salts which showed low temperature superconductivity [11,12]
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