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  • $\begingroup$ ch.imperial.ac.uk/rzepa/blog/?p=17122 $\endgroup$
    – andselisk ♦
    Commented Jan 9, 2018 at 17:58
  • 2
    $\begingroup$ Feel free to use Henry's blog as a starting point. (Consider that I might ping him to add an answer too. :-) $\endgroup$
    – Geoff Hutchison
    Commented Jan 9, 2018 at 18:00
  • 1
    $\begingroup$ tbh; this is a lot more challenging than I initially thought. C=C does not like to be stretched. $\endgroup$
    – Martin - マーチン ♦
    Commented Jan 15, 2018 at 13:06
  • 6
    $\begingroup$ I also must admit that Henry Rzepa did a great job fetching those structures from CCDC. I followed his approach, and oh boy, I haven't seen so many garbage crystal structures with C=C bonds from 1.7 up to 2 Å in years. $\endgroup$
    – andselisk ♦
    Commented Jan 17, 2018 at 18:26
  • $\begingroup$ Not directly related to the topic, but since you mentioned the longest C-C single bond, the record has now been drastically increased to 1.806(2) Å - "Longest C–C Single Bond among Neutral Hydrocarbons with a Bond Length beyond 1.8 Å". $\endgroup$
    – Nicolau Saker Neto
    Commented Mar 10, 2018 at 23:23