Noncovalent ?-stacked robust topological organic framework.

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 ????? transfer dominates transport in organic semiconductors. However, because of extremely labile inherent features of noncovalent ????? interaction, direct construction of robust frameworks via noncovalent ????? interaction is a difficult task. Toward this goal, we report a robust noncovalent ????? interaction-stacked organic framework, namely ?OF, consisting of a permanent three-dimensional porous structure that is held together by pure intralayer noncovalent ????? 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. ?OF 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 ????? interaction, we demonstrate remarkable transport properties of ?OF in an organic-field-effect transistor, and the mobility displays relative superiority over the traditional COFs. These promising results position ?OF in a direction toward porous and yet conductive materials for high-performance organic electronics.

SUBMITTER: Meng D 

PROVIDER: S-EPMC7456091 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature