Ternary MOF-on-MOF heterostructures with controllable architectural and compositional complexity via multiple selective assembly

Chao Liu,Rong Huang,Jingjing Wan,Chunhong Xia,Tong Bao,Jin Zou,Jing Wang,Chaoqi Zhang,Lina Lin,Chengzhong Yu,Qiang Sun

doi:10.1038/s41467-020-18776-z

Chao Liu, Rong Huang + Show 9 more

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Assembly of different metal-organic framework (MOF) building blocks into hybrid MOF-on-MOF heterostructures is promising in chemistry and materials science, however the development of ternary MOF-on-MOF heterostructures with controllable architectural and compositional complexity is challenging. Here we report the synthesis of three types of ternary MOF-on-MOF heterostructures via a multiple selective assembly strategy. This strategy relies on the choice of one host MOF with more than one facet that can arrange the growth of a guest MOF, where the arrangement is site-selective without homogenous growth of guest MOF or homogenous coating of guest on host MOF. The growth of guest MOF on a selected site of host MOF in each step provides the opportunity to further vary the combinations of arrangements in multiple steps, leading to ternary MOF-on-MOF heterostructures with tunable complexity. The developed strategy paves the way towards the rational design of intricate and unprecedented MOF-based superstructures for various applications.

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Of different metal-organic framework (MOF) building blocks into hybrid metal-organic frameworks (MOFs)-onMOF heterostructures is promising in chemistry and materials science, the development of ternary MOF-on-MOF heterostructures with controllable architectural and compositional complexity is challenging
We report the synthesis of three types of ternary MOFon-MOF hybrids with adjustable architectural complexity and a distinct compositional combination consisted of three different MOFs as building blocks (Fig. 1)
For type C ternary MOF-on-MOF heterostructure, ZIF-8 pods are adhered on the four corners of core-shell-structured cake, which is formed by Zn, Co-ZIF shell coated on the two top-bottom and four side surfaces of MIL-125 core in a one-step approach (III)

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Of different metal-organic framework (MOF) building blocks into hybrid MOF-onMOF heterostructures is promising in chemistry and materials science, the development of ternary MOF-on-MOF heterostructures with controllable architectural and compositional complexity is challenging. We report the synthesis of three types of ternary MOFon-MOF hybrids with adjustable architectural complexity and a distinct compositional combination consisted of three different MOFs as building blocks (Fig. 1). By using cake-like MIL-125 as the host MOF, ternary MOF-on-MOF hybrids, including quintuple sandwich-like (type A), cake@tetrapods with core-shellstructured pod (type B) and cake@tetrapods with core-shellstructured cake (type C) heterostructures, are obtained via a multiple selective assembly strategy in three approaches. For type C ternary MOF-on-MOF heterostructure, ZIF-8 pods are adhered on the four corners of core-shell-structured cake, which is formed by Zn, Co-ZIF shell coated on the two top-bottom and four side surfaces of MIL-125 core in a one-step approach (III)

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