“…[13] (PcRu) 2 reacts easily with ligands L such as pyrazine, stetrazine, 1,4-diisocyanobenzene and others to form the corresponding monomers PcRu(L) 2 , and under somewhat different conditions to form the bridged systems [PcRu(L)] n . [4,14] Although the monomeric complexes PcM(L) 2 (L ϭ pyz, tz, dib; M ϭ Fe, Ru, Os) are all insulators, it can be seen that the ligand (L) has a significant effect on the conductivity of the bridged complexes [PcM(L)] n : as 1,4-diazabicyclo[2.2.2]octane (dabco) is a ligand containing no π-orbitals to interact with the metallomacrocycle the [PcM(dabco)] n complexes are also insulators, [2] whereas an increase in electrical conductivity is observed for the pyrazine-and 1,4-diisocyanobenzene-bridged compounds. [PcRu(pyz)] n (2) and [PcRu(dib)] n (3) exhibit electrical conductivities (σ RT ϭ 1 ϫ 10 Ϫ7 S cm Ϫ1 and σ RT ϭ 2 ϫ 10 Ϫ6 S cm Ϫ1 ) [4,15] in the low semiconducting region.…”