【摘 要】
：
Cationic azole-based metal-organic frameworks (MOFs) with remarkable stability and unique pore environment have aroused great research interests.Meanwhile,flexible MOFs which can undergo pore-structure changes upon exposure to external stimuli are ideal m
【机 构】
：
Key Laboratory of Polyoxometalate Science of Ministry of Education,Northeast Normal University,Chang
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Cationic azole-based metal-organic frameworks (MOFs) with remarkable stability and unique pore environment have aroused great research interests.Meanwhile,flexible MOFs which can undergo pore-structure changes upon exposure to external stimuli are ideal materials for gas separation.However,introducing flexibility into the framework of cationic azole-based MOFs is rarely reported.Herein,we synthesized two stable isomorphic cationic MOFs (M-btz-as,M =Co,Ni) based on a linear azole ligand.After activated at high temperature under vacuum,M-btz-ht (M =Co,Ni) were obtained and both MOFs exhibited flexible features in which Co-btz is more flexible than Ni-btz.Different solvent-mediated activation methods were employed to explore their effects on structural flexibility and produced MOFs with different phases.Continuous phase transformation of Co-btz-e was verified by powder X-ray diffraction.In addition,these MOF phases possessed different gas separation abilities affected by their flexible frameworks,and Co-btz-ht exhibited the highest CO2/CH4 separation ability.
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