1370447-49-6Relevant articles and documents
A bimodal oxobenzene-bridged bisdithiazolyl radical conductor
Yu, Xin,Mailman, Aaron,Lekin, Kristina,Assoud, Abdeljalil,Dube, Paul A.,Oakley, Richard T.
, p. 2485 - 2494 (2012)
The preparation and structural characterization of the methyl-substituted oxobenzene-bridged bisdithiazolyl radical 3b is described. Crystals of 3b belong to the monoclinic space group C2/c and contain two distinct radical environments, A and B. There are eight A radicals in the unit cell, which occupy general positions and form alternating twisted π-stacks running parallel to the c-axis. The four B radicals also adopt an alternating π-stack pattern, but each molecule lies on a crystallographic 2-fold rotation axis, and the overlay of neighboring radicals is centrosymmetric. Stacks of A radicals are linked by close intermolecular S???O′ and S???N′ contacts into ribbon-like arrays that weave along the y-direction, and the B radical stacks are located in columnar cavities generated by the out-of-register alignment of the ribbons of A radicals. Variable temperature magnetic susceptibility measurements indicate a strongly antiferromagnetically coupled system, a result in accord with DFT estimated exchange energies for intrastack radical-radical interactions. Four-probe conductivity measurements indicate a conductivity σ(300 K) = 9.0 × 10-4 S cm-1, with a thermal activation energy E act = 0.13 eV.