SYNTHESIS AND CHARACTERIZATION OF NEW NICKEL AND PLATINUM COMPLEXES DERIVED FROM THE 5,6-DIHYDRO-1,4-DITHIIN-2,3-DITHIOLATE (DDDT) LIGAND

Electrochemical studies shows that the M(dddt)2 (M = Ni, Pt) complexes exist as dianionic, monoanionic, neutral and fractional oxidation sta te cationic species. Associating the M(dddt)2 complexes with the Ni(dm t)2 acceptor yields a new type of bisdithiolene compounds containing a bisdithiolene ligand simultaneously in the cationic and in the anioni c part. The two phases [Ni(dddt)2]x[Ni(dmit)2]y and [Pt(dddt)2][Ni(dmi t)2] have been synthesized ; both compounds are insulators (sigma(powd er) = 10(-5) S/cm). The crystal structure of [Pt(dddt)2][Ni(dmit)2] is reported. The TTF[Ni(dddt)2]x salt has been also prepared; its room-t emperature single crystal conductivity is 10(-5) S/cm.