Cargando…

Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks

[Image: see text] Metal–organic frameworks (MOFs) can respond to light in a number of interesting ways. Photochromism is observed when a structural change to the framework is induced by the absorption of light, which results in a color change. In this work, we show that introducing quinoxaline ligan...

Descripción completa

Detalles Bibliográficos
Autores principales: Cornelio, Joel, Lee, Seok June, Zhou, Tian-You, Alkaş, Adil, Thangavel, Kavipriya, Pöppl, Andreas, Telfer, Shane G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10242685/
https://www.ncbi.nlm.nih.gov/pubmed/37288142
http://dx.doi.org/10.1021/acs.chemmater.2c02220
_version_ 1785054271076564992
author Cornelio, Joel
Lee, Seok June
Zhou, Tian-You
Alkaş, Adil
Thangavel, Kavipriya
Pöppl, Andreas
Telfer, Shane G.
author_facet Cornelio, Joel
Lee, Seok June
Zhou, Tian-You
Alkaş, Adil
Thangavel, Kavipriya
Pöppl, Andreas
Telfer, Shane G.
author_sort Cornelio, Joel
collection PubMed
description [Image: see text] Metal–organic frameworks (MOFs) can respond to light in a number of interesting ways. Photochromism is observed when a structural change to the framework is induced by the absorption of light, which results in a color change. In this work, we show that introducing quinoxaline ligands to MUF-7 and MUF-77 (MUF = Massey University Framework) produces photochromic MOFs that change color from yellow to red upon the absorption of 405 nm light. This photochromism is observed only when the quinoxaline units are incorporated into the framework and not for the standalone ligands in the solid state. Electron paramagnetic resonance (EPR) spectroscopy shows that organic radicals form upon irradiation of the MOFs. The EPR signal intensities and longevity depend on the precise structural details of the ligand and framework. The photogenerated radicals are stable for long periods in the dark but can be switched back to the diamagnetic state by exposure to visible light. Single-crystal X-ray diffraction analysis reveals bond length changes upon irradiation that are consistent with electron transfer. The multicomponent nature of these frameworks allows the photochromism to emerge by allowing through-space electron transfer, precisely positioning the framework building blocks, and tolerating functional group modifications to the ligands.
format Online
Article
Text
id pubmed-10242685
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher American Chemical Society
record_format MEDLINE/PubMed
spelling pubmed-102426852023-06-07 Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks Cornelio, Joel Lee, Seok June Zhou, Tian-You Alkaş, Adil Thangavel, Kavipriya Pöppl, Andreas Telfer, Shane G. Chem Mater [Image: see text] Metal–organic frameworks (MOFs) can respond to light in a number of interesting ways. Photochromism is observed when a structural change to the framework is induced by the absorption of light, which results in a color change. In this work, we show that introducing quinoxaline ligands to MUF-7 and MUF-77 (MUF = Massey University Framework) produces photochromic MOFs that change color from yellow to red upon the absorption of 405 nm light. This photochromism is observed only when the quinoxaline units are incorporated into the framework and not for the standalone ligands in the solid state. Electron paramagnetic resonance (EPR) spectroscopy shows that organic radicals form upon irradiation of the MOFs. The EPR signal intensities and longevity depend on the precise structural details of the ligand and framework. The photogenerated radicals are stable for long periods in the dark but can be switched back to the diamagnetic state by exposure to visible light. Single-crystal X-ray diffraction analysis reveals bond length changes upon irradiation that are consistent with electron transfer. The multicomponent nature of these frameworks allows the photochromism to emerge by allowing through-space electron transfer, precisely positioning the framework building blocks, and tolerating functional group modifications to the ligands. American Chemical Society 2022-09-15 /pmc/articles/PMC10242685/ /pubmed/37288142 http://dx.doi.org/10.1021/acs.chemmater.2c02220 Text en © 2022 American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Cornelio, Joel
Lee, Seok June
Zhou, Tian-You
Alkaş, Adil
Thangavel, Kavipriya
Pöppl, Andreas
Telfer, Shane G.
Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks
title Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks
title_full Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks
title_fullStr Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks
title_full_unstemmed Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks
title_short Photoinduced Electron Transfer in Multicomponent Truxene-Quinoxaline Metal–Organic Frameworks
title_sort photoinduced electron transfer in multicomponent truxene-quinoxaline metal–organic frameworks
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10242685/
https://www.ncbi.nlm.nih.gov/pubmed/37288142
http://dx.doi.org/10.1021/acs.chemmater.2c02220
work_keys_str_mv AT corneliojoel photoinducedelectrontransferinmulticomponenttruxenequinoxalinemetalorganicframeworks
AT leeseokjune photoinducedelectrontransferinmulticomponenttruxenequinoxalinemetalorganicframeworks
AT zhoutianyou photoinducedelectrontransferinmulticomponenttruxenequinoxalinemetalorganicframeworks
AT alkasadil photoinducedelectrontransferinmulticomponenttruxenequinoxalinemetalorganicframeworks
AT thangavelkavipriya photoinducedelectrontransferinmulticomponenttruxenequinoxalinemetalorganicframeworks
AT popplandreas photoinducedelectrontransferinmulticomponenttruxenequinoxalinemetalorganicframeworks
AT telfershaneg photoinducedelectrontransferinmulticomponenttruxenequinoxalinemetalorganicframeworks