Metal-induced valence isomerizations: gas-phase reactions of iron(I) and copper(I) with quadricyclane and norbornadiene

Metal-promoted valence isomerizations and cycloreversions occur in the gas phase for adducts of norbornadiene (NBD) and quadricyclane (Q) with either Fe(I) or Cu(I). The collisionally activated decomposition (CAD) spectra of the adducts of NBD and Q with each metal indicate that the complexes possess identical structures, although the structures that are formed with Fe(I) are different from those with Cu(I).