The reaction of the carbazole ligand supported Ga(I) compound LGa(THF) (3) and 1-azido-4-(tert-butyl)benzene (ArN3) afforded the first stable tetrazagallole LGaN4Ar2 (4) bearing a three-coordinate Ga atom. Reduction of 4 with...

Magnesium(I) complexes have attracted a great deal of attention because of their practical application as elegant organicsoluble reducing agents in small-molecule activation and organometallic synthesis. However, no stable mononuclear magnesium(I) compounds have been isolated so far. Herein, we used the ligand 3,6di-tert-butyl-1,8-bis(10-phenylanthracen-9-yl)carbazolyl (L − ) to synthesize the magnesium(I) species, and the magnesium complex LMg(THF) 2 (3) was isolated. Electron paramagnetic resonance spectroscopic studies and theoretical calculations reveal that the unpaired electron mainly resides at one of the anthracenyl moieties, and 3 is essentially a magnesium(II)-radical dianion complex.

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