As reported in 2019,
magnesium monocyanoacetylide (MgC3N or Mg–C≡C–C≡N) was detected toward
IRC +10216 by
Cernicharo and co-workers using the IRAM
30m telescope. The detection was based upon experimental
and theoretical work by
Cabezas et al. also published in 2019.
Magnesium monocyanoacetylide has a dipole moment that exceeds 6 D, which enhances its rotational spectrum compared to
molecules with smaller dipole moments.
While Petrie and co-workers
had assigned certain doublet lines in IRC +10216 to MgC3N in 2003, subsequent
analysis determined that those
lines should be assigned to C6H.
Like MgC3N, most of the magnesium-containing molecules detected to date are linear doublet species, including
MgC4H (to be featured
next month). Magnesium forms linear X–Mg–Y compounds, such as
HMgNC (detected in 2013), because
its 3s2 pair of electrons is recoupled.