MOLECULAR-COMPLEXES OF EXTENDED SULFUR DONOR LIGANDS

Dianionic and neutral bis TTF dithiolate mercury and nickel complexes have been prepared. X-ray structural studies show the geometry around the mercury to be tetrahedral and CV and esr measurements indicate ver y little interaction between the two TTF based ligands. Conductivity m easurements on the neutral mercury complexes gave sigma(RT) = 10(-5) S cm(-1) whereas for the neutral nickel complexes values of 10(-2) - 10( -1) Scm(-1) are observed. The salts [TTF](x)[Fe(tdas)(2)] x = 2, 3/2 ( tdas = 1,2,5-thiadiazole-3,4-dithiol) have been prepared by electrocry stallisation and show conductivities of 10(-2) Scm(-1) and 10(-5) Scm( -1) respectively. The former salt displays thermally activated magneti c behaviour and the latter shows a Curie-type temperature dependance.