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A monovalent aluminum monomer HC (CMeNAr) 2Al was obtained by reduction of the corresponding aluminum (III) diiodide. The molecular structure shows a unique two-coordinate aluminum center and a planar heterocyclic Al-N-C-C-C-N six-membered ring system (see picture). A nonbonded lone pair of electrons on the Al atom indicates the Lewis base character of the aluminum center. Ar=2, 6-iPr2C6H3.
Cui et al. (Fri,) studied this question.