Chemistry Reference
In-Depth Information
Fig. 2.7
Examples of the dynamic chemical reactions for the preparation of COFs.
a
Boronate
ester ring formation.
b
BO
2
C
2
ring formation.
c
ZnCl
2
mediated nitrile cyclotrimerization.
d
Imine reaction.
e
Hydrazone reaction
2.3.2 Topology Concerns in COFs
COFs are organic porous polymers with periodic networks. To clearly illustrate the
structures of COFs, the concept of topology, which is a clear symbol describing
framework structures directly, has been proposed. The understanding of topology
plays a fundamental role in bridging the various building blocks and the possibly
resulted structures. Topology is the mathematical study of shapes and topological
spaces. It is a subfield of mathematics concerned with the properties of space that
are preserved under continuous deformations, including properties such as connec-
tivity, continuity, and boundary. In virtue of analysis of concepts such as space,
dimension, and transformation, topology theory has been developed as a field of
studying the geometry and set theory.
