Chemistry Reference
In-Depth Information
Fig. 2.1
Illustration of synthesis procedure of porous organic frameworks:
a
two parts of the
monomers, which are the reactive groups and their configurations;
b
monomers with special
reactive groups and configurations;
c
effective polymerization reactions based on the reactive
groups;
d
porous organic frameworks constructed by the suitable building units via effective
reactions
the monomers and reactions should be combined simultaneously. In other words,
the synergistic effect of two factors could influence the chemical and physical
characteristics of the resulting samples.
To present the resulted structures of POFs clearly and concretely, the underlying
topology plays a fundamental role as schematically shown in Fig.
2.2
[
1
]. The
basic and necessary components in POFs are the organic monomers, which
are generally utilized in the construction of secondary building units (SBUs).
Meanwhile, possible sites for forming bonds of the monomers could determine
the connection manners, and they will direct the geometry of the dimensional nets,
including one-, two-, and three-dimensional periodic nets. By the method of sim-
plification/transformation, the monomers are transformed into corresponding nets,
seen from the exemplified monomers in Fig.
2.2
. Combined with SBUs and their
connectivity, ''true'' topology of POFs is predicted to describe the most possible
structure. Therefore, a comprehensive understanding of the underlying topologies
will provide favorable assistance in the directionality for the construction of open
and robust POF frameworks.
