Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue
Abstract The confinement of organic chromophores within mesoporous material architectures can exert a considerable alteration on their physico‐chemical properties. This study presents a detailed spectroscopic investigation of methylene blue (MB) entrapped in mesoporous polymeric carbon nitrides (mPC...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2023-11-01
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| Series: | ChemistryEurope |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ceur.202300031 |
| _version_ | 1827632030836326400 |
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| author | Dr. Chunyu Li Dr. Erik Troschke Dr. Carolin Müller Anindita Dasgupta Prof. Dr. Christian Eggeling Prof. Dr. Martin Oschatz Prof. Dr. Benjamin Dietzek‐Ivanšić |
| author_facet | Dr. Chunyu Li Dr. Erik Troschke Dr. Carolin Müller Anindita Dasgupta Prof. Dr. Christian Eggeling Prof. Dr. Martin Oschatz Prof. Dr. Benjamin Dietzek‐Ivanšić |
| author_sort | Dr. Chunyu Li |
| collection | DOAJ |
| description | Abstract The confinement of organic chromophores within mesoporous material architectures can exert a considerable alteration on their physico‐chemical properties. This study presents a detailed spectroscopic investigation of methylene blue (MB) entrapped in mesoporous polymeric carbon nitrides (mPCNs) with different pore architecturesusing transient absorption spectroscopy (TAS). The spatial confinement of MB molecules results in a prominent change in absorption spectra, characterized by both redshifts and the appearance of additional shoulder peaks, arising from the formation of MB dimers (MB2) concomitant with a distortion of the MB structure. Upon photoexcitation, entrapped MB molecules exhibit a notable altered excited‐state absorption feature, along with a drastic excited‐state quenching within 2 ns compared to molecues in bulk solutions. In contrast to the ultrafast quenching of sole MB2 with a lifetime of ~3.6 ps in highly concentrated solutions, the concentration‐dependent quenching behavior of MB aggregates in confined environments suggests the effect is caused by excimers formed in close proximity. The findings of this work highlight the impact of constrained environments and intermolecular interactions on the relaxation pathways of the excited states in photoactive molecules. |
| first_indexed | 2024-03-09T14:29:25Z |
| format | Article |
| id | doaj.art-0e3973cb97c94792bb49a5eca7cd19b8 |
| institution | Directory Open Access Journal |
| issn | 2751-4765 |
| language | English |
| last_indexed | 2024-03-09T14:29:25Z |
| publishDate | 2023-11-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | ChemistryEurope |
| spelling | doaj.art-0e3973cb97c94792bb49a5eca7cd19b82023-11-28T02:09:21ZengWiley-VCHChemistryEurope2751-47652023-11-0113n/an/a10.1002/ceur.202300031Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene BlueDr. Chunyu Li0Dr. Erik Troschke1Dr. Carolin Müller2Anindita Dasgupta3Prof. Dr. Christian Eggeling4Prof. Dr. Martin Oschatz5Prof. Dr. Benjamin Dietzek‐Ivanšić6Institute of Physical Chemistry Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena GermanyCenter for Energy and Environmental Chemistry Jena (CEEC Jena) Philosophenweg 7a 07743 Jena GermanyDepartment of Physics and Materials Science University of Luxembourg 162a Avenue de la Faïencerie 1511 Luxembourg LuxembourgInstitute of Applied Optics and Biophysics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena GermanyInstitute of Applied Optics and Biophysics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena GermanyCenter for Energy and Environmental Chemistry Jena (CEEC Jena) Philosophenweg 7a 07743 Jena GermanyInstitute of Physical Chemistry Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena GermanyAbstract The confinement of organic chromophores within mesoporous material architectures can exert a considerable alteration on their physico‐chemical properties. This study presents a detailed spectroscopic investigation of methylene blue (MB) entrapped in mesoporous polymeric carbon nitrides (mPCNs) with different pore architecturesusing transient absorption spectroscopy (TAS). The spatial confinement of MB molecules results in a prominent change in absorption spectra, characterized by both redshifts and the appearance of additional shoulder peaks, arising from the formation of MB dimers (MB2) concomitant with a distortion of the MB structure. Upon photoexcitation, entrapped MB molecules exhibit a notable altered excited‐state absorption feature, along with a drastic excited‐state quenching within 2 ns compared to molecues in bulk solutions. In contrast to the ultrafast quenching of sole MB2 with a lifetime of ~3.6 ps in highly concentrated solutions, the concentration‐dependent quenching behavior of MB aggregates in confined environments suggests the effect is caused by excimers formed in close proximity. The findings of this work highlight the impact of constrained environments and intermolecular interactions on the relaxation pathways of the excited states in photoactive molecules.https://doi.org/10.1002/ceur.202300031methylene bluemesoporous carbon nitridetransient absorptionspatial confinement |
| spellingShingle | Dr. Chunyu Li Dr. Erik Troschke Dr. Carolin Müller Anindita Dasgupta Prof. Dr. Christian Eggeling Prof. Dr. Martin Oschatz Prof. Dr. Benjamin Dietzek‐Ivanšić Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue ChemistryEurope methylene blue mesoporous carbon nitride transient absorption spatial confinement |
| title | Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue |
| title_full | Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue |
| title_fullStr | Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue |
| title_full_unstemmed | Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue |
| title_short | Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue |
| title_sort | pore nanoarchitectonics of carbon nitrides for the excited state deactivation of confined methylene blue |
| topic | methylene blue mesoporous carbon nitride transient absorption spatial confinement |
| url | https://doi.org/10.1002/ceur.202300031 |
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