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$\begingroup$ I didn't check yesterday, but: TBNBL II "has an RHF->UHF instability". The rest "is stable under the perturbations considered." I was asked, if it is really a double bond or maybe a radical: HOMO and LUMO, pi and pi* of the DB, are separated by more than 2 eV (except for TBNBL II, where it is 0.23 eV). I'll leave TBNBL II in the answer, because it shows my working process, but I guess it is actually no DB. $\endgroup$
– pH13 - Yet another Philipp
Commented Feb 5, 2018 at 13:17
1

$\begingroup$ Out of curiosity.. what if you change the Cl to Br? Seems like the added radius would help the "ring push" aspect? $\endgroup$
– Geoff Hutchison
Commented Feb 6, 2018 at 19:14

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