RADICAL SALTS OF THE ORGANIC DONOR BET-TTF WITH POLYOXOMETALATE CLUSTERS

The synthesis, structures and physical characterizations of the first radical ion salts of the organic donor BET-TTF 1 with polyoxometalate clusters ([M6O19](2-); M = W-VI, Mo-VI, 2) are reported. The 2:1 salts (BET-TTF+)(2)[M6O19](2-) are formed by pairs of the BET-TTF+ radical cations surrounded by polyanions so as to form a 3D packing of anions and cations with short intermolecular contacts between the cation pair s. The synthesis, physical properties and main structural features of the first radical ion salts of the organic donor BET-TTF 1 with the po lyoxometalate cluster [SiW12O40](4-) 3 are also reported. The 4:1 salt (BET-TTF+)(4)[SiW12O40](4-) is formed by a 2D hexagonal packing of an ions ana by isolated BET-TTF+ pairs. The compounds are insulators and diamagnetic.