1642809-32-2Relevant academic research and scientific papers
Expandability of Ultralong CC Bonds: Largely Different C1C2 bond lengths determined by low-temperature x-ray structural analyses on Pseudopolymorphs of 1,1-Bis(4-fluorophenyl)-2,2-bis(4-methoxyphenyl)pyracene
Suzuki, Takanori,Uchimura, Yasuto,Nagasawa, Fumika,Takeda, Takashi,Kawai, Hidetoshi,Katoono, Ryo,Fujiwara, Kenshu,Murakoshi, Kei,Fukushima, Takanori,Nagaki, Aiichiro,Yoshida, Jun-Ichi
supporting information, p. 86 - 88 (2014/01/23)
Low-temperature X-ray analyses on several pseudopolymorphs (solvate crystals) revealed that the C1C2 bond length of the highly congested title molecule can adopt quite different values [1.700(6)1.739( 6)]. Such an unusual observation indicates that the ultralong covalent bond is endowed with expandability, thus the prestrained bond can be elongated or shortened very easily accompanied by only a minute change in energy, which can be compensated by intermolecular perturbation in the crystal.
