I am a mathematician not a chemist, so my questions are naive and rather combinatorial. I am intrigued by the possibility of the following compound:

$$\ce{N- = N+ = C = N+ = N-}$$

which ought to be isoelectronic with carbon suboxide, and thus possibly stable. Does this compound exist, even in interstellar space?

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    $\begingroup$ Now that's an interesting question. After all, diazomethane is a thing. $\endgroup$ – Ivan Neretin May 6 '18 at 9:42
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    $\begingroup$ There were 0 hits on ChemSpider Structure Search. $\endgroup$ – Avnish Kabaj May 6 '18 at 9:50
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    $\begingroup$ Looks horrendously unstable $\endgroup$ – Waylander May 6 '18 at 10:11
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    $\begingroup$ Cyanogen azide, $\ce{(N$\!\equiv\!$C-N=N^+=N^-)}$, is pretty similar but not quite. $\endgroup$ – Linear Christmas May 6 '18 at 10:57
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    $\begingroup$ @Oscar Lanzi maybe on top of the ear defenders, face shield and arc flash glasses (UV blocking) one should wear the Ned Kelly helmet (Steel bucket with a small eye slot), maybe one should work from behind a sheet of thick steel using a master slave manipulator or maybe choose a different synthetic target to work on. $\endgroup$ – Nuclear Chemist May 7 '18 at 4:41

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