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

• Published in: Dalton transactions : an international journal of inorganic chemistry 2017-04, Vol.46 (13), p.4422-4429
• Main Authors: Kurokawa, Masashi, Jose-Larong, Judy Fe F, Hasegawa, Hiroyuki, Takahashi, Yukihiro, Harada, Jun, Inabe, Tamotsu
• Format: Article
• Language: English
• Subjects: Acetone; Byproducts; Crystals; Deformation; Electrical resistivity; Radicals; Semiconductors; Solvents
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c6dt04418b

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)2·2CH3CN are obtained with CH3CN 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.