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A novel series of isoreticular metal organic frameworks: realizing metastable structures by liquid phase epitaxy

机译:一系列新的等孔金属有机骨架:通过液相外延实现亚稳态结构

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摘要

A novel class of metal organic frameworks (MOFs) has been synthesized from Cu-acetate and dicarboxylic acids using liquid phase epitaxy. The SURMOF-2 isoreticular series exhibits P4 symmetry, for the longest linker a channel-size of 3 × 3 nm2 is obtained, one of the largest values reported for any MOF so far. High quality, ab-initio electronic structure calculations confirm the stability of a regular packing of (Cu++)2- carboxylate paddle-wheel planes with P4 symmetry and reveal, that the SURMOF-2 structures are in fact metastable, with a fairly large activation barrier for the transition to the bulk MOF-2 structures exhibiting a lower, twofold (P2 or C2) symmetry. The theoretical calculations also allow identifying the mechanism for the low-temperature epitaxial growth process and to explain, why a synthesis of this highly interesting, new class of high-symmetry, metastable MOFs is not possible using the conventional solvothermal process.
机译:已经使用液相外延从乙酸铜和二羧酸合成了一类新型的金属有机骨架(MOF)。 SURMOF-2等网状系列表现出P4对称性,对于最长的连接子,可得到3×3 nm 2 的通道大小,这是迄今为止任何MOF报道的最大值之一。高质量的从头算电子结构计算证实了具有(P4)对称性的(Cu ++ )2-羧酸盐桨轮平面规则堆积的稳定性,并显示SURMOF-2结构处于实际上是亚稳态的,具有相当大的激活势垒,用于过渡到整体MOF-2结构,具有较低的两倍(P2或C2)对称性。理论计算还可以确定低温外延生长过程的机理,并解释为什么使用常规的溶剂热方法无法合成这种高度有趣的新型高对称性亚稳态MOF。

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