Bipolaron



Bipolarons in physics

In physics, a bipolaron is a bound pair of two isotope effect.

Bipolarons in organic chemistry

In polythiophene.

It is possible to synthesize and isolate bipolaron model compounds for X-ray diffraction studies [1]. The diamagnetic bis(triaryl)amine dication 2 in scheme 1 is prepared from the neutral precursor 1 in bond lengths for the central vinylidene group in 2 are 141 pm and 137 pm compared to 144 pm and 134 pm for the precursor 1 implying some contribution from the quinoid structure.

On the other hand when a thiophene unit is added to the core in the structure depicted in scheme 2, these bond lengths are identical (around 138 pm) making it a true hybrid.

See also

References

  • ^  Isolation and Crystal Structures of Two Singlet Bis(Triarylamine) Dications with Nonquinoidal Geometries Shijun Zheng, Stephen Barlow, Chad Risko, Tiffany L. Kinnibrugh, Viktor N. Khrustalev, Simon C. Jones, Mikhail Yu. Antipin, Neil M. Tucker, Tatiana V. Timofeeva, Veaceslav Coropceanu, Jean-Luc Brédas, and Seth R. Marder J. Am. Chem. Soc.; 2006; 128(6) pp 1812 - 1817; Abstract
 
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