Multistep Structural Transformation of a Magnetic Metal–Organic Framework: Possible Transformation Mechanism, Form Evolution, and Magnetic Properties
journal contributionposted on 09.01.2020, 20:33 by Dong-Li Meng, Xue Wang, Chong-Bin Tian, Wei Wei, Shao-Wu Du
A new cluster-based heterometallic metal–organic framework, [Mn3Li2(TBIP)4(DMF)4] (1) (H2TBIP = 5-tert-butylisophthalic acid), was solvothermally synthesized. Triggered by methanol, the α-Po network of 1 underwent a sequence of irreversible structural transformation to form a CdSO4-type framework [Mn(TBIP)(H2O)3]·4H2O(5), during which course three intermediate phases, 2–4 were observed. A single crystal X-ray diffraction analysis reveals that 4, formulated as [Mn3(TBIP)3(MeOH)4], exhibits the same topology network of 1 but with a different node structure. Notably, the evolution of form from microcrystals 1 to diverse forms, including core–shell and Janus-type heterostructures, was achieved by controlling the time of methanol immersion. Moreover, the overall structural transformation from 1 to 5 was monitored by magnetic susceptibility, scanning electron microscopy, inductively Coupled Plasma analysis, and electron paramagnetic resonance, which provide useful information for understanding the mechanism of this transformation.
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topology networkMultistep Structural Transformationtransformationcrystal X-ray diffraction analysisnode structuremicrocrystals 1type frameworkCdSO 4Mn 3Form Evolutionα- Po networkDMFMagnetic Propertiesmethanol immersionJanus-type heterostructuresscanning electron microscopy5- tertMn 3 Li 2Plasma analysisPossible Transformation MechanismH 2 TBIP