Expandability of Ultralong C–C Bonds: Largely Different C1–C2 Bond Lengths Determined by Low-temperature X-ray Structural Analyses on Pseudopolymorphs of 1,1-Bis(4-fluorophenyl)-2,2-bis(4-methoxyphenyl)pyracene

2014 
Low-temperature X-ray analyses on several pseudopolymorphs (solvate crystals) revealed that the C1–C2 bond length of the highly congested title molecule can adopt quite different values [1.700(6)–1...
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