Hydrogen bonding of radicals: Interaction of dimethyl ether with HOO, HOOH, and HOO−

Dimethyl ether is paired with hydroperoxy radical, and closed-shell analogues HOOH and OOH−. The more strongly bound minimum contains a OH⋯O bond, along with blueshifting CH⋯O; the other minimum contains exclusively CH⋯O. The data help explain how the H-bonds are affected by the open-shell character of the OOH radical.