The oxyisocyanate [ONCO] and amidoisocyanate [HNNCO] negative ions

Abstract
Ab initio calculations indicate that the ion [ONCO] is linear, whereas [HNNCO] is effectively coplanar. The ions may be formed by collisional activation of deprotonated hydroxy and aminocarbamates. The characteristic fragmentations of [ONCO] and [HNNOO] are losses of O and NH respectively.