BEDT-TTF radical-cation salts with tris(oxalato)chromate and guest additives

Abstract

The family of radical-cation salts β′′-(BEDT-TTF)₄[(A)M³⁺(C₂O₄)₃]·guest (M = Fe, Cr, Ga, Al, Co, Mn, Rh, Ru; A = K⁺, H₃O⁺, NH₄⁺) has produced superconductors, metals, semiconductors, and metal–insulators through introduction of different guest molecules into the structure. We present three new additions to the family β′′-(BEDT-TTF)₄[(A)Cr(C₂O₄)₃]·guest with the guest molecules toluene, phenol, or salicylaldehyde. These new guests are liquid or solid additives within the electrocrystallisation medium. All three salts show metallic behaviour from room temperature down to <10 K and do not show a superconducting transition.