Lee Sujeong, Lee Gihyun, Oh Moonhyun
Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
ACS Nano. 2021 Nov 23;15(11):17907-17916. doi: 10.1021/acsnano.1c06207. Epub 2021 Nov 4.
Constructing metal-organic frameworks (MOFs) to have a desired structure from the given components is critical to achieve ideal MOFs with optimal properties. However, thermodynamics and/or kinetics typically impose a restriction on MOF structures. Here, we report the MOF farming concept to produce a naturally nonpreferred structure from the given components. The HKUST-1 template offers ideal places for the efficient seeding and epitaxial growth of Ga-MIL-88B that is a naturally nonpreferred structure however intentionally produced instead of the preferred Ga-MIL-68. The MOF growth on the differently shaped HKUST-1 templates (octahedral, cuboctahedral, and cubic), containing different exposed lattices, proves that a hexagonal lattice with an exposed {111} plane of HKUST-1 selectively directs the perpendicular growth of Ga-MIL-88B, owing to the lattice matching with the {001} plane of Ga-MIL-88B. The grown Ga-MIL-88B is isolated in a pure form, and the refreshed template is reused to grow additional Ga-MIL-88B.
从给定的组件构建具有所需结构的金属有机框架（MOF）对于获得具有最佳性能的理想MOF至关重要。然而，热力学和/或动力学通常会对MOF结构施加限制。在此，我们报告了MOF培育概念，以从给定的组件中产生天然非优选的结构。HKUST-1模板为Ga-MIL-88B的高效晶种生长和外延生长提供了理想的场所，Ga-MIL-88B是一种天然非优选的结构，但却是有意生成的，而不是优选的Ga-MIL-68。在不同形状（八面体、立方八面体和立方体）且包含不同暴露晶格的HKUST-1模板上进行的MOF生长证明，具有HKUST-1暴露{111}平面的六边形晶格由于与Ga-MIL-88B的{001}平面晶格匹配，选择性地引导了Ga-MIL-88B的垂直生长。生长得到的Ga-MIL-88B以纯形式分离出来，并且刷新后的模板可重复用于生长更多的Ga-MIL-88B。
