First radical cation salts of 2,5-bis(l,3-dithian-2-ylidene)-l,3,4,6-tetrathiapentalene(BDA-TTP) with copper(II) metal complex anions;beta-(BDA-TTP)_4Cu_2Cl_6 and (BDA-TTP)_2CuCl_4

摘要

New radical cation salts based on 2,5-bis(l,3-dithian-2-ylidene)-l,3,4,6-tetrathiapentalene (BDA-TTP) with copper(II) metal complex anions,p-(BDA-TTP)_4Cu_2Cl_6 and (BDA-TTP)_2CuCl_4,were synthesized and structurally characterized.Single crystals were prepared by electrochemical oxidation of BDA-TTP under galvanostatic conditions.X-ray diffraction study demonstrated that the salts have a layered structure,in which the conducting BDA-TTP layers alternate with the [Cu_2Cl_6]~(2_) or [CuCl_4]~(2-) anions.Both salts show the semiconductor-type temperature dependence of the conductivity.