Conjugated organic framework with three-dimensionally ordered stable structure and delocalized π clouds.
Covalent organic frameworks are a class of crystalline organic porous materials that can utilize π-π-stacking interactions as a driving force for the crystallization of polygonal sheets to form layered frameworks and ordered pores. However, typical examples are chemically unstable and lack intrasheet π-conjugation, thereby significantly limiting their applications. Here we report a chemically stable, electronically conjugated organic framework with topologically designed wire frameworks and open nanochannels, in which the π conjugation-spans the two-dimensional sheets. Our framework permits inborn periodic ordering of conjugated chains in all three dimensions and exhibits a striking combination of properties: chemical stability, extended π-delocalization, ability to host guest molecules and hole mobility. We show that the π-conjugated organic framework is useful for high on-off ratio photoswitches and photovoltaic cells. Therefore, this strategy may constitute a step towards realizing ordered semiconducting porous materials for innovations based on two-dimensionally extended π systems.
1] Department of Materials Molecular Science, Institute for Molecular Science, National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan [2] State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.
Jia
J
Guo
Yanhong
Y
Xu
Shangbin
S
Jin
Long
L
Chen
Toshihiko
T
Kaji
Yoshihito
Y
Honsho
Matthew A
MA
Addicoat
Jangbae
J
Kim
Akinori
A
Saeki
Hyotcherl
H
Ihee
Shu
S
Seki
Stephan
S
Irle
Masahiro
M
Hiramoto
Jia
J
Gao
Donglin
D
Jiang