generate γ-UWDM-6 and β-UWDM-7. The dynamics of the 24-membered macrocycle ([24]crown-6) inside each MOF phase was studied using variable-temperature 2H solid-state NMR spectroscopy. Interestingly, only solvated α-UWDM-7 demonstrates unrestricted rotation of the macrocycle inside the MOF pores; studies on α-UWDM-7 with various solvents showed that the dynamics of the wheel is essentially independent of the
锌(II)
金属-有机骨架(MOF)材料是使用基于
卟啉的四
羧酸酯连接基和
吡啶末端的[2]轮烷连接基制备的。使用两个柱状轮烷(在
吡啶2位的R = H或CH 3)生成两个MOFα-UW
DM-6和α-UW
DM-7,并通过单晶X射线衍射确定其结构。两种MOF在去除溶剂后均经历可逆相变,生成γ-UW
DM-6和β-UW
DM-7。使用可变温度2 H固态NMR光谱研究了每个MOF相内部的24元大环([24] cro-6)的动力学。有趣的是,只有溶剂化的α-UW
DM-7证明MOF孔内大环的旋转不受限制;用各种溶剂对α-UW
DM-7进行的研究表明,砂轮的动力学特性基本上与溶剂无关。