CFA-1: the first chiral metal–organic framework containing Kuratowski-type secondary building units
作者:Phillip Schmieder、Dmytro Denysenko、Maciej Grzywa、Benjamin Baumgärtner、Irena Senkovska、Stefan Kaskel、German Sastre、Leo van Wüllen、Dirk Volkmer
DOI:10.1039/c3dt50787d
日期:——
The novel homochiral metalâorganic framework CFA-1 (Coordination Framework Augsburg-1), [Zn5(OAc)4(bibta)3], containing the achiral linker H2-bibta = 1H,1â²H-5,5â²-bibenzo[d][1,2,3]triazole}, has been synthesised. The reaction of H2-bibta and Zn(OAc)2·2H2O in N-methylformamide (NMF) (90 °C, 3 d) yields CFA-1 as trigonal prismatic single crystals. CFA-1 serves as a convenient precursor for the synthesis of isostructural frameworks with redox-active metal centres, which is demonstrated by the postsynthetic exchange of Zn2+ by Co2+ ions. The framework is robust to solvent removal and has been structurally characterized by synchrotron single-crystal X-ray diffraction and solid state NMR measurements (13C MAS- and 1H MAS-NMR at 10 kHz). Results from MAS-NMR and IR spectroscopy studies are corroborated by cluster and periodic DFT calculations performed on CFA-1 cluster fragments.
已经合成了新型同手性金属-有机框架CFA-1(奥格斯堡-1配位框架),[Zn5(OAc)4(bibta)3],其中包含非手性连接剂H2-bibta = 1H,1²H-5,5²-联苯并[d][1,2,3]三唑}。在N-甲基甲酰胺(NMF)中,H2-bibta和Zn(OAc)2·2H2O的反应(90°C,3天)产生了CFA-1,为三棱柱单晶。CFA-1是合成具有氧化还原活性金属中心的同构框架的便捷前体,这一点可以通过合成后Zn2+与Co2+离子交换来证明。该框架对溶剂去除具有很好的稳定性,并通过同步辐射单晶X射线衍射和固态核磁共振测量(13C MAS和1H MAS-NMR,10 kHz)进行了结构表征。MAS-NMR和红外光谱研究的结果通过在CFA-1簇片段上进行的簇和周期性DFT计算得到了证实。