posted on 2016-02-29, 00:00authored byGuiqing Lin, Huimin Ding, Daqiang Yuan, Baoshan Wang, Cheng Wang
The targeted synthesis of 3D COFs
has been considered challenging,
especially adopting new topologies and bearing photoelectric units.
Herein, for the first time, we report the synthesis and characterization
of a novel 3D pyrene-based COF (3D-Py-COF), by selectively choosing
the geometry of the precursors and the connection patterns. Based
on X-ray diffraction measurement and detailed simulations, 3D-Py-COF
is proposed to adopt a two-fold interpenetrated pts topology,
which has never been reported before. In addition, 3D-Py-COF has a
narrow pore size distribution and high surface area and also features
selective absorption of CO2 over N2. Interestingly,
due to the existence of isolated pyrene units in the 3D framework,
3D-Py-COF is the first fluorescent 3D COF and can be used in explosive
detection. Our results not only show it is possible to rationally
design and synthesize 3D COFs with other topologies but also demonstrate
that the incorporation of photoelectric units into 3D COFs can allow
the resulting materials with interesting properties.