Thus, subtle modulations of the ligand via alteration of substituents on the -diketone ligand and/or bidentate nitrogen donor coligand play a substantial impact on the magnetization relaxation dynamics of Dy complexes. Apart from these great efforts, a significant and intense development is still needed to construct a straightforward and reliable magneto-structural relationship in lanthanide-based SMMs, which will develop a better understanding of how ligand field, structural parameters, intermolecular interactions and crystallographic packing alter the dynamic behaviour of structurally analogous lanthanide-based systems.