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ACS Nano. 2019 May 28;13(5):5251-5258. doi: 10.1021/acsnano.8b09634. Epub 2019 Apr 29.

Organic Radical-Linked Covalent Triazine Framework with Paramagnetic Behavior.

Author information

1
Center for Multidimensional Carbon Materials (CMCM) , Institute for Basic Science (IBS) , Ulsan 44919 , Republic of Korea.

Abstract

The production of multifunctional pure organic materials that combine different sizes of pores and a large number of electron spins is highly desirable due to their potential applications as polarizers for dynamic nuclear polarization-nuclear magnetic resonance and as catalysts and magnetic separation media. Here, we report a polychlorotriphenylmethyl radical-linked covalent triazine framework (PTMR-CTF). Two different sizes of micropores were established by N2 sorption and the presence of unpaired electrons (carbon radicals) by electron spin resonance and superconducting quantum interference device-vibrating sample magnetometer analyses. Magnetization measurements demonstrate that this material exhibits spin-half paramagnetism with a spin concentration of ∼2.63 × 1023 spins/mol. We also determined the microscopic origin of the magnetic moments in PTMR-CTF by investigating its spin density and electronic structure using density functional theory calculations.

KEYWORDS:

covalent triazine framework; different pore size; electron spins; polychlorotriphenylmethyl radical; spin concentration; spin-half paramagnetism

PMID:
31033280
DOI:
10.1021/acsnano.8b09634

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