Electrical-Conductivity Of Ladder-Type Polymeric Transition-Metal Complexes Derived From 2,5-Diamino-1,4-Benzenedithiol

Ladder-type polymeric transition metal(II) complexes based on 2,5-diamino-1,4-benzenedithiol (DADT) are synthesized. DADT is a unique ligand among S,N-donor ligand systems in that its metal complexes have a high conductivity, particularly the Co(II) complex (sigma(RT) = 1.6 S/cm); reaction with atmospheric oxygen decreases the conductivity. These complexes are paramagnetic with g values of 2 at room temperature, but their spin densities vary markedly depending upon the complexed metal. The conductivities of these metal(II) complexes are discussed in relation to oxygenation and magnetic properties.