Issue 13, 2017

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

Abstract

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.

Graphical abstract: 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

Supplementary files

Article information

Article type
Paper
Submitted
22 Nov 2016
Accepted
05 Mar 2017
First published
06 Mar 2017

Dalton Trans., 2017,46, 4422-4429

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

M. Kurokawa, J. F. F. Jose-Larong, H. Hasegawa, Y. Takahashi, J. Harada and T. Inabe, Dalton Trans., 2017, 46, 4422 DOI: 10.1039/C6DT04418B

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