2 research outputs found
3D Porphyrin-Based Covalent Organic Frameworks
The design and synthesis
of three-dimensional covalent organic
frameworks (3D COFs) bearing photoelectric units have been considered
as a big challenge. Herein, for the first time, we reported the targeted
synthesis of two 3D porphyrin-based COFs (3D-Por-COF and 3D-CuPor-COF),
starting from tetrahedral (3D-<i>T</i><sub>d</sub>) and
square (2D-<i>C</i><sub>4</sub>) building blocks connected
through [4 + 4] imine condensation reactions. On the basis of structural
characterizations, 3D-Por-COF and 3D-CuPor-COF are microporous materials
with high surface areas, and are proposed to adopt a 2-fold interpenetrated <b>pts</b> topology with <i>Pmc</i>2<sub>1</sub> space
group. Interestingly, both 3D COFs are photosensitive and can be used
as heterogeneous catalyst for generating singlet oxygen under photoirradiation.
However, 3D-Por-COF shows enhanced photocatalytic activity compared
with 3D-CuPor-COF, indicating the properties of 3D porphyrin-based
COFs can be tuned by metalation of porphyrin rings. The results reported
here will greatly inspire us to design and synthesize 3D COFs bearing
other metalloporphyrins for interesting applications (e.g., catalysis)
in the future
Engineering a Zirconium MOF through Tandem “Click” Reactions: A General Strategy for Quantitative Loading of Bifunctional Groups on the Pore Surface
Metal–organic frameworks (MOFs)
assembled from linkers of identical length but with different functional
groups have gained increasing interests recently. However, it is very
challenging for precise control of the ratios of different functionalities.
Herein, we reported a stable azide- and alkyne-appended Zr-MOF that
can undergo quantitative tandem click reactions on the different functional
sites, thus providing a unique platform for quantitative loading of
bifunctional moieties. As an added advantage, the same MOF product
can be obtained via two independent routes. The method is versatile
and can tolerate a wide variety of functional groups, and furthermore,
a heterogeneous acid–base MOF organocatalyst was synthesized
by tandemly introducing both acidic and basic groups onto the predesigned
pore surface. The presented strategy provides a general way toward
the construction of bifunctional MOFs with a precise control of ratio
of different functionalities for desirable applications in future