Self-assembly of linear [MnII2MnIII] units with end-on azido bridges: the construction of a ferromagnetic chain using ST = 7 high-spin trimers

Abstract

The controlled organization of high-spin complexes into 1D coordination polymers is a challenge in molecular magnetism. In this work, we report a ferromagnetic Mn trimer Mn₃(HL)₂(CH₃OH)₆(Br)₄·Br·(CH₃OH)₂1 (H₂L = 2-[(9H-fluoren-9-yl)amino]propane-1,3-diol) with the ground spin state of S_T = 7 that can be assembled into a one-dimensional coordination chain [Mn₃(HL)₂(CH₃OH)₂(Br)₄(N₃)(H₂O)·CH₃OH]_∞2 using azido bridging ligands. Interestingly, the ferromagnetic nature of 1 is well retained in 2. However, due to the negligible magnetic anisotropy in 1, both 1 and 2 do not show slow-relaxation of magnetization, which indicates that during the process of molecular assembly not only the intratrimer magnetic interaction but also the magnetic anisotropy of the trimer can be reserved.