Capture and activation of aerial CO2 by carbamoylation of L-threonine in a Ag(I) supramolecular framework

An ultrasonic reaction of Ag2O, 4,4'-bipyridine (bipy) and (2S, 3R)-3-amino-2-hydroxybutanoic acid (L-Thr) gives an unexpected Ag(I) supramolecular framework, {[Ag-3(bipy)(3)(cahba)]center dot HCO3 center dot 10H(2)O}(n) (1), in which the (2S, 3R)-3-(carboxyamino)-2-hydroxybutanoic acid (H(2)cahba) is a carbamate derivative of L-Thr, obtained via in situ transformation of amino group of L-Thr into carbamate by means of CO2 uptake.