Synthesis, structure and properties of new nickel-bis(ferrocenyldithiolene)

Tetra-n-butylammonium bis(2,3-diferrocenyl-1,4-dithiin-5,6-dithiolato) nickel(III) complex, TBA[Ni(dfcvdt)2], is prepared and obtained as crystals (orthorhombic, Pnma, a = 20.457, b = 39.220, c = 8.496å, V = 6817å3 and Z = 4), in which ferrocenes are covalently connected to dithiolene ligand. It shows strong near-IR absorption (λmax = 1155nm, logε = 4.06dm3/mol cm). Upon treatment of iodine, TBA complex is oxidized to neutral one, [Ni(dfcvdt)2]0, as Ni(dddt)2 complexes are. Pressed pellet conductivity of neutral complex is measured as 10−5 S/cm at room temp.