Surface crossings are likely to take place if the triplet state is lower in energy. Together, this supports our assumptions on the isodiagonal relationship and the suitability of low-valent manganese systems as they are comparable to iron. Our investigated complexes 1-Mn and 2-Mn do fulfill several requirements for OM such as low barriers for cycloaddition and -reversion, as well as feature electronic descriptors that are indicative for functioning OM -given a singlet spin state.