Construction of microporous metal–organic frameworks (MOFs) by Mn–O–C rod-like secondary building units (SBUs): Solvothermal synthesis, structure, thermostability, and magnetic properties

Herein, we report two microporous MOFs, viz. Mn3(1,4-BDC)3(μ-DMF)2 (1), and Mn4(1,3-BDC)4(μ2-DMF)2 · (DMF)2 (2). Both 1 and 2 are constructed from the Mn–O–C rod-like SBUs and afford the irregular rhombic channels occupied by coordinated or free DMF molecules. The topology analysis suggests the pcu (also named α-Po) net for1 and sra (also named Al in SrAl2) net for 2. Moreover, the 1D Fisher mode is applied to analysis the experimental magnetic data, resulted in the J =− 1.12 cm−1, θ = 0.15 K, g = 2.0 for 1 and J =− 2.07 cm−1, θ = 0.21 K, g = 1.98 for 2, which suggests the antiferromagnetic interactions within the Mn–O–C rod and inter-chain ferromagnetic interactions (1,4-BDC = 1,4-benzenedicarboxylate, 1,3-BDC = 1,3-benzenedicarboxylate, J, g, and θ parameter are magnetic coupling parameter, Zeeman factor and the inter-chain interactions, respectively).