A conducting crystal based on a single-component paramagnetic molecule, [Cu(dmdt)(2)] (dmdt = dimethyltetrathiafulvalenedithiolate)

A single-component conducting molecular crystal composed of paramagnetic copper complexes, Cu(dmdt)2]0+, was prepared. The crystal has an unprecedented three-dimensionally packed molecular arrangement and exhibits a fairly high conductivity (1 S cm-1 at room temperature). The magnetic susceptibility measurements revealed that Cu(dmdt)2]0+ molecule keeps most of S = 1/2 spin moments. The difference of the bond lengths between Cu(dmdt)2]0+ and Cu(dmdt)2]2- is consistent with the result of the molecular orbital calculation.