Generation and Dissociation of RCOOCaCl2− and other Carboxylate‐Substituted Superhalogens: CO2 Capture and Implications for Structure Analysis

Carboxylate-substituted superhalogens of the type RCOOMX₂ ^- (M=Mg, Ca, Sr, Ba, Mn, Co, Ni, Zn; X=Cl, Br) are easily accessible in the gas phase by electrospray ionisation. Their collision-induced dissociation (CID) characteristics have been probed by using ion-trap and triple-quadrupole mass analysers with particular emphasis on the behaviour of RCOOCaCl₂ ^- -type ions. In the ion trap these appear to react readily with residual water to yield …