Noncovalent π-stacked robust topological organic framework.
Proc Natl Acad Sci U S A
; 117(34): 20397-20403, 2020 Aug 25.
Article
in En
| MEDLINE
| ID: mdl-32788358
ABSTRACT
Organic frameworks (OFs) offer a novel strategy for assembling organic semiconductors into robust networks that facilitate transport, especially the covalent organic frameworks (COFs). However, poor electrical conductivity through covalent bonds and insolubility of COFs limit their practical applications in organic electronics. It is known that the two-dimensional intralayer πâââπ transfer dominates transport in organic semiconductors. However, because of extremely labile inherent features of noncovalent πâââπ interaction, direct construction of robust frameworks via noncovalent πâââπ interaction is a difficult task. Toward this goal, we report a robust noncovalent πâââπ interaction-stacked organic framework, namely πOF, consisting of a permanent three-dimensional porous structure that is held together by pure intralayer noncovalent πâââπ interactions. The elaborate porous structure, with a 1.69-nm supramaximal micropore, is composed of fully conjugated rigid aromatic tetragonal-disphenoid-shaped molecules with four identical platforms. πOF shows excellent thermostability and high recyclability and exhibits self-healing properties by which the parent porosity is recovered upon solvent annealing at room temperature. Taking advantage of the long-range πâââπ interaction, we demonstrate remarkable transport properties of πOF in an organic-field-effect transistor, and the mobility displays relative superiority over the traditional COFs. These promising results position πOF in a direction toward porous and yet conductive materials for high-performance organic electronics.
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01-internacional
Database:
MEDLINE
Language:
En
Journal:
Proc Natl Acad Sci U S A
Year:
2020
Type:
Article