Thermally Induced Persistent Covalent-Organic Frameworks Radicals

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)23903–23912
Journal / PublicationACS Nano
Volume17
Issue number23
Online published28 Nov 2023
Publication statusPublished - 12 Dec 2023

Abstract

Persistent covalent-organic framework (COF) radicals hold important applications in magnetics and spintronics; however, their facile synthesis remains a daunting challenge. Here, three p-phenylenediacetonitrile-based COFs (named CityU-4, CityU-5, and CityU-6) were synthesized. Upon heat treatment (250 °C for CityU-4 and CityU-5 or 220 °C for CityU-6), these frameworks were brought into their persistent radical forms (no obvious changes after at least one year), together with several observable factors, including color changes, red-shifted absorption, the appearance of electron spin resonance (ESR) signals, and detectable magnetic susceptibility. The theoretical simulation suggests that after heat treatment, lower total energy and nonzero spin density are two main factors to guarantee persistent COFs radicals and polarized spin distributions. This work provides an efficient method for the preparation of persistent COF radicals with promising potentials. © 2023 American Chemical Society

Research Area(s)

  • COF radicals, covalent organic frameworks, magnetic susceptibility, spin polarization, thermally induced radicals

Citation Format(s)

Thermally Induced Persistent Covalent-Organic Frameworks Radicals. / Gu, Qianfeng; Lu, Xiangqian; Chen, Cailing et al.
In: ACS Nano, Vol. 17, No. 23, 12.12.2023, p. 23903–23912.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review