Efficient and Reversible Fixation of Carbon Dioxide by NCN-Chelated Organoantimony(III) Oxide

The dimeric organoantimony(III) oxide (ArSbO) 2 (Ar = NCN chelating ligand, C 6 H 3 -2,6-(CH 2 NMe 2 ) 2 ) was obtained by the reaction of the parent ArSbCl 2 compound with KOH. This oxide is able to bind carbon dioxide with formation of the monomeric, air-stable carbonate ArSbCO 3 . In turn, carbon dioxide can be easily eliminated from this carbonate by prolonged heating to 130 °C to recover (ArSbO) 2 .