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Perchloro-2,5,8-triazaphenalenyl Radical

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journal contribution
posted on 28.04.2005 by Shijun Zheng, Joe D. Thompson, Ana Tontcheva, Saeed I. Khan, Yves Rubin
The unusually stable perchloro-2,5,8-triazaphenalenyl radical 1 and its twisted dechlorinated dimer 2 were synthesized and characterized by ESR spectroscopy and X-ray crystallography. The X-ray structure of dimer 2 shows that the double bond connecting the two triazaphenalene systems is strongly twisted. Dimer 2 has a dramatic color shift from the solid state to solution, which may be due to a change of the twisting angle between both states.