Switching pairwise exchange interactions to enhance SMM properties

A simple change in the identity of “R” in the family of complexes of general formula [Mn6O2(R-sao)6(O2C-th)2L4-6] (where saoH2 = salicylaldoxime) causes subtle changes in the magnetic core of the compounds that leads to dramatic changes in the magnetic behaviour, switching the pairwise exchange interactions from anti- to ferromagnetic, greatly enhancing the barrier for magnetization relaxation.