We report the anion [Al(NON )(Se)] (NON =[O(SiMe NAr) ] , Ar=2,6-iPr C H ), which is an isoelectronic Group 13 metal analogue of the carbonyl group containing an aluminium-selenium multiple bond. It was synthesized in a single step from the reaction of the aluminyl anion [Al(NON )] with elemental selenium. Spectroscopic, crystallographic, and computational analysis confirmed multiple bonding between aluminium and selenium. Addition of a second equivalent of selenium afforded the diselenirane, [Al(NON )(κ -Se )] , which is an isoelectronic analogue of the dioxirane group.
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