The two-dimensional thin metal–organic
frameworks (MOF)
sheet has emerged as a promising hybrid material for applications
in catalysis and optoelectronic devices. However, the small size and
large thickness of an MOF sheet still pose barriers toward its potential
applications. Herein, a micron-sized ultrathin MOF sheet is synthesized
with the assistance of benzoic acid. Benzoic acid promoted the coordination
of the porphyrin center with copper ions, reduced H-stacking and J-aggregation
between the layers, and induced anisotropic growth of the MOF sheet.
The results reveal the growth mechanism and provide a viable method
for the synthesis of ultrathin MOF sheet. The as-prepared micron-sized
ultrathin MOF sheet has good dispersion and high stability, which
can ensure the long-term application properties of this material.
The ultrathin thickness in combination with its micron size can make
MOF as useful as graphene in practical applications. The synthesis
of a micron-sized ultrathin MOF sheet similar to the thickness of
graphene can pave the way for effective applications of two-dimensional
MOF materials.
A novel porphyrin-based two-dimensional metal–organic framework (MOF) nanodisk with small size and few layers was prepared by coordination chelation between meso-tetra(4-carboxyphenyl)porphine ligand and Zn(ii) paddlewheel metal nodes.
Here, ferric oxide-loaded
metal–organic framework (FeTCPP/Fe2O3 MOF) nanorice was designed and constructed by
the liquid diffusion method. The introduction of iron metal nodes
and the loading of Fe2O3 can effectively catalyze
the Fenton reaction to produce hydroxyl radicals (•OH) and overcome the hypoxic environment of tumor tissue by generating
oxygen. The monodispersity and porosity of the porphyrin photosensitizers
in the MOF structure exposed more active sites, which promoted energy
exchange between porphyrin molecules and oxygen molecules for photodynamic
therapy (PDT) treatment. Therefore, the generated hydroxyl radicals
and singlet oxygen (1O2) can synergistically
act on tumor cells to achieve the purpose of improving tumor therapy.
Then the erythrocyte membrane was camouflaged to enhance blood circulation
and tissue residence time in the body, and finally, the targeted molecule
AS1411 aptamer was modified to achieve the high enrichment of MOF
photosensitizers on a tumor domain. As a result, the MOF nanorice
camouflaged by the erythrocyte membrane can effectively reduce side
effects and improve the therapeutic effect of PDT and chemo-dynamic
therapy (CDT). The study not only improved the efficacy of PDT and
CDT in essence from the MOF nanorice but also used the camouflage
method to further concentrate FeTCPP/Fe2O3 on
the tumor sites, achieving the goal of multiple gains. These results
will provide theoretical and practical directions for the development
of tumor-targeted MOF nanomaterials.
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