一个基于3-(3',5'-二羧基苯基)-6-羧基吡啶的Co-MOF的合成、结构及质子传导性能
Synthesis, structure, and proton conductivity of a Co-MOF based on 3-(3′,5′-dicarboxyphenyl)-6-carboxylic pyridine
作者单位E-mail
刘厚亭 聊城大学化学化工学院, 山东省化学储能与新型电池技术重点实验室, 聊城 252059 liuhouting@lcu.edu.cn 
丁利 聊城大学化学化工学院, 山东省化学储能与新型电池技术重点实验室, 聊城 252059  
周传聪 聊城大学化学化工学院, 山东省化学储能与新型电池技术重点实验室, 聊城 252059  
邹会琪 聊城大学化学化工学院, 山东省化学储能与新型电池技术重点实验室, 聊城 252059  
卢静 聊城大学化学化工学院, 山东省化学储能与新型电池技术重点实验室, 聊城 252059  
王素娜 聊城大学化学化工学院, 山东省化学储能与新型电池技术重点实验室, 聊城 252059  
李允伍 聊城大学化学化工学院, 山东省化学储能与新型电池技术重点实验室, 聊城 252059  
摘要: 选用刚性多羧酸有机配体H3L (3-(3',5'-二羧基苯基)-6-羧基吡啶)与过渡金属Co(Ⅱ)盐在水热条件下得到Co-MOF:{[Co3(L)2(H2O)6]·3H2O}n (1)。X射线单晶结构分析表明,L3-配体利用其3个羧基以及吡啶氮原子将Co(Ⅱ)连接形成了三维多孔骨架,孔道由结晶水分子填充。结构中的配位水与结晶水分子间通过氢键连接形成连续的一维水链,为质子传导提供了良好的路径。将配合物1与Nafion混合制作1/Nafion复合膜,交流阻抗分析结果表明配合物1的掺杂使得复合膜的质子电导率比纯Nafion膜提升了40.3%。
关键词: 金属有机骨架  质子传导  晶体结构  水热合成
基金项目: 国家自然科学基金(No.21571092, 21771095)、 山东省高等学校青创科技支持计划(No.2019KJC027)和山东省自然科学基金(No.ZR2021MB073)资助。
Abstract: A Co-MOF {[Co3(L)2(H2O)6]·3H2O}n (1) was obtained by hydrothermal reactions of rigid polycarboxylic acid organic ligand H3L(3-(3′,5′-dicarboxyphenyl)-6-carboxypyridine) and transition metal Co(Ⅱ). The IR spectrum and stability of 1 were characterized. The X-ray single crystal structure analyses showed that ligand L3- uses its three carboxylate groups and pyridine nitrogen atoms to connect Co(Ⅱ) cations to form a 3D porous framework with lattice water molecules filled in. The coordinated and lattice water molecules are connected by hydrogen bonds to form a continuous 1D water chain. To study the proton conduction behavior of complex 1, it was doped with Nafion to obtain a 1/Nafion composite membrane. The results of AC impedance analyses showed that the doping of complex 1 can increase the proton conductivity of the composite membrane by 40.3% compared with pure Nafion membrane. The studies of the structure-property relationship showed that the continuous hydrogen bond chains and hydrophilic channels in the crystal structure of 1 are the main reasons for its good proton conductivity. CCDC: 2195972.
Keywords: metal-organic frameworks  proton conduction  crystal structure  hydrothermal synthesis
投稿时间:2022-08-20 修订日期:2022-12-15
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