Subscripts low spin (LS) and high spin (HS) refer to (broken-symmetry) low-spin and (spinpure) high-spin states. AP geometries were obtained by standard geometry optimization methods. In this work, the phrase "AP geometry" refers to the optimized ground state structure of a complex, whether the ground state corresponds to the AP calculated LS or spin-pure HS state. In other words, the AP geometry strategy employs the geometry of the ground state that is either a spin-pure HS state or a spin-projected (using AP) LS state.