The cyanine distortion of doubly charged ethylenes leading to twisted molecular halves connected by a C–C single bond inciudes tetrakis(p-dimethylaminophenyl)ethylene, which on twofold oxidation with iodine increases its twist angle ω from 19 to 53° and its central C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C bond length from 135 to 150 pm as predicted by PM3 calculations.
H. Bock, C. Näther and Z. Havlas, J. Chem. Soc., Chem. Commun., 1995, 1111 DOI: 10.1039/C39950001111
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