Organic Metals. Systematic Molecular Modifications of Hexamethylenetetraheterofulvalene Donors

Two synthetic approaches for modifying hexamethylenetetraheterofulvalene donors are described for the purpose of perturbing in a systematic way the interesting solid state properties of the TCNQ salts of the parent systems. The first approach consists of a steric modification in which a methyl group is introduced into the outer five-membered rings of the parent molecules. The second type of modification involves an electronic perturbation in which the outer five-membered alkyl rings are replaced with fused thiophene derivatives