N-methylation of a benzimidazole ligand switches the helicity of a tetranuclear manganese complex and changes the redox behavior.
Porphyrin metal–organic framework PMOF-2 with a 3D pillar-layered framework showed a better third-order NLO performance than PMOF-1 with a 2D bilayer, revealing the influence of dimensions on third-order nonlinear properties of MOFs.