Two tetrathiafulvalene salts of a new thiophene-functionalised ferracarborane: electrical conductivity as a function of crystal composition

Two tetrathiafulvalenium (TTF) salts of the new sandwich complex commo-3{,}3prime or minute]-Fe1-(thiophene-2-yl)-1,2-CBH], TTFFe(CBHCHS) and TTFFe(CBHCHS){,} are synthesized; while the 1 : 1 salt is an insulator{,} the 5 : 2 salt is a semiconductor featuring a conducting superlattice associated with a sublattice that shows ferromagnetic interactions between the ferracarborane complexes; single crystal X-ray studies of the 5 : 2 salt indicate that the electrical conductivity originates from a unique mixed-valence TTF network