Structural and transport properties of neutral radical crystals of Co III (tmp)(CN) 2 (tmp = 5,10,15,20-tetramethylporphyrinato) and the CN-bridged polymer [Co III (tmp)(CN)] n .

An axially ligated Co(tmp) (tmp = 5,10,15,20-tetramethylporphyrinato) anion, [CoIII (tmp)(CN)2 ]- , has been prepared and subjected to electrochemical oxidation to obtain the open shell tmp π-ligand. With acetone as the solvent, solvent-free neutral radical crystals of CoIII (tmp)(CN)2 are obtained, whereas solvent-inclusive crystals of CoIII (tmp)(CN)2 ·2CH3 CN are obtained with CH3 CN as the solvent. In both crystals, the open shell tmp ring deforms into a ruffled form, which makes the π-π interactions in the crystal weak. Thus, the electrical conductivity is low, and the crystals behave as semiconductors with a room temperature resistivity of 106 Ω cm and an activation energy of about 0.3 eV. When the solvent is acetone, non-oxidized crystals of the CN-bridged polymer {[CoIII (tmp)(CN)](acetone)}n are obtained as a byproduct. The closed shell tmp ring deforms into a ruffled form, and there π-π interactions in the crystal are negligible. The room temperature resistivity is rather high at about 108 Ω cm.