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Tip-To-Middle Anisotropic MOF-On-MOF Growth with a Structural Adjustment
journal contribution
posted on 2020-01-31, 23:09 authored by Gihyun Lee, Sujeong Lee, Sojin Oh, Dooyoung Kim, Moonhyun OhWell-organized construction
of hybrid metal–organic frameworks
(MOFs) with complicated structures or components is a great importance
because of their potential usefulness. In this regard, the conjugation
of more than two MOFs, which have dissimilar components and/or structures,
is a smart strategy for the production of hybrid MOFs. MOF-on-MOF
growth is fundamental for the conjugation of two MOFs and should be
deeply understood for the finely controlled conjugation and for the
formation of well-organized hybrid MOFs. Herein, we report an interesting
MOF growth process for the construction of hybrid MOF particles containing
heterogeneous components and cell lattices. Interestingly, even though
a newly grown MOF and an MOF template have mismatched cell lattices,
the anisotropic growth results in unexpectedly well-defined core–shell-type
hybrid MOFs. Comprehensive monitoring of the growth process revealed
a tip-to-middle MOF-on-MOF growth, which elucidates the uncommon formation
of a well-defined core–shell hybrid despite the anisotropic
growth. A tip-to-middle anisotropic growth process is accompanied
by self-adjustment of MOF cell lattices to anchor on the template
surface having mismatched cell lattices in the early reaction stage
and self-reversion of cell lattices to the original comfortable configuration
in the middle stage of the reaction.