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Many molecules exhibit multiple rotational isomers (conformers) thatinterconvert thermally and are difficult to isolate. Consequently, a precisecharacterization of their role in chemical reactions has proven challenging. Wehave probed the reactivity of specific conformers using an experimentaltechnique based on their spatial separation in a molecular beam byelectrostatic deflection. The separated conformers react with a target ofCoulomb-crystallized ions in a trap. In the reaction of Ca$^+$ with3-aminophenol, we find a twofold larger rate constant for the \textit{cis}-compared to the \textit{trans}-conformer (differentiated by the O-H bondorientation). This result is explained by conformer-specific differences in thelong-range ion-molecule interaction potentials. Our approach demonstrates thepossibility of controlling reactivity through selection of conformationalstates.

Specific chemical reactivities of spatially separated 3-aminophenol conformers with cold Ca$^+$ ions