钴
超分子化学
堆积
化学
氢键
背景(考古学)
脱质子化
结晶学
离子
无机化学
有机化学
分子
晶体结构
生物
古生物学
作者
Jing-Yan Zhu,Kusum Kumari,Shijie Chen,Dong Shao,Jiong Yang,Le Shi,Saurabh Kumar Singh,Yuan‐Zhu Zhang
标识
DOI:10.1021/acs.cgd.4c00188
摘要
Supramolecular isomerism has been recognized as an effective strategy for manipulating structures and properties, particularly in metal–hydrogen-bonded organic frameworks (MHOFs). However, it has been less studied in the context of magnetic dynamics. In this study, we reinvestigated two previously reported cobalt(II) HOFs, {[(H2O)2Co(Hbic)2]·sol}n (H2bic = 1H-benzimidazole-5-carboxylic acid; 1, Sol = 2DMF·1.5H2O; 2, Sol = H2O), which exhibit unique supramolecular isomerism. In both complexes, octahedral Co(II) ions are connected by deprotonated Hbic-ligands to form one-dimensional chains, which are then sustained into three-dimensional frameworks by prominent N–H···O hydrogen-bonding interactions. This results in significantly different porosities and N2-adsorption abilities: a high solvent-accessible void of 46.2% for the desolvated phase of 1, compared to only 2.3% for that of 2, likely due to the additional π–π stacking interactions. Interestingly, our magnetic studies revealed that both 1 and 2 exhibit typical single ion magnet behaviors, with alternating relaxation dynamics (Raman, direct, and QTM for 1; Raman and direct for 2). These findings demonstrate that the structures, stability, porosities, and magnetic properties of MHOF materials can be effectively tuned through a supramolecular isomerization approach.
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