Photoswitching, aggregation, and negative photochromism in ionic arylazoisoxazolium photoswitches.
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| Title: | Photoswitching, aggregation, and negative photochromism in ionic arylazoisoxazolium photoswitches. |
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| Authors: | Parthiban, Gayathri1 (AUTHOR), Kumar, Himanshu1 (AUTHOR), Parambattummal, Anees Rahman1 (AUTHOR), Venkataramani, Sugumar1 (AUTHOR) sugumarv@iisermohali.ac.in |
| Source: | Photochemistry & Photobiology. May/Jun2026, Vol. 102 Issue 3, p653-665. 13p. |
| Subjects: | Photochromism, Azo compounds, Relaxation phenomena, Fluorescence, Microscopy, Photoactivation |
| Abstract: | The direct introduction of ionic character in azoheteroarenes led to the generation of azopyridinium, azoimidazolium, and azopyrazolium photoswitches, which have previously garnered intriguing application prospects due to their varied Z‐E thermal relaxation properties. We leveraged this foundation to design and synthesize three azoisoxazolium‐based ionic photoswitches, aiming to expand their application scope and tailor their properties. The investigations on their photoswitching characteristics in different solvents, including water, revealed a solvent‐dependent aggregation that competes with isomerization, although their thermal relaxations slow down the aggregation. Also, spectroscopic and dynamic light scattering (DLS) studies showed that the azoisoxazolium ionic photoswitches can exhibit negative photochromism, light‐induced disaggregation at low concentrations in one of the derivatives, and significantly fluorescence emission in water. In addition, microscopic studies using scanning electron microscope (SEM), transmission electron microscope (TEM), polarized optical microscope (POM), and confocal microscope revealed the size and structural morphology and mesophase changes of the aggregates. Overall, our comprehensive investigation has positioned azoisoxazolium salts as a new class of ionic photoswitches characterized by several intriguing properties and a pronounced tendency to aggregate. [ABSTRACT FROM AUTHOR] |
| Copyright of Photochemistry & Photobiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194204371 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Photoswitching, aggregation, and negative photochromism in ionic arylazoisoxazolium photoswitches. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Parthiban%2C+Gayathri%22">Parthiban, Gayathri</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kumar%2C+Himanshu%22">Kumar, Himanshu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Parambattummal%2C+Anees+Rahman%22">Parambattummal, Anees Rahman</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Venkataramani%2C+Sugumar%22">Venkataramani, Sugumar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sugumarv@iisermohali.ac.in</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Photochemistry+%26+Photobiology%22">Photochemistry & Photobiology</searchLink>. May/Jun2026, Vol. 102 Issue 3, p653-665. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Photochromism%22">Photochromism</searchLink><br /><searchLink fieldCode="DE" term="%22Azo+compounds%22">Azo compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Relaxation+phenomena%22">Relaxation phenomena</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence%22">Fluorescence</searchLink><br /><searchLink fieldCode="DE" term="%22Microscopy%22">Microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Photoactivation%22">Photoactivation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The direct introduction of ionic character in azoheteroarenes led to the generation of azopyridinium, azoimidazolium, and azopyrazolium photoswitches, which have previously garnered intriguing application prospects due to their varied Z‐E thermal relaxation properties. We leveraged this foundation to design and synthesize three azoisoxazolium‐based ionic photoswitches, aiming to expand their application scope and tailor their properties. The investigations on their photoswitching characteristics in different solvents, including water, revealed a solvent‐dependent aggregation that competes with isomerization, although their thermal relaxations slow down the aggregation. Also, spectroscopic and dynamic light scattering (DLS) studies showed that the azoisoxazolium ionic photoswitches can exhibit negative photochromism, light‐induced disaggregation at low concentrations in one of the derivatives, and significantly fluorescence emission in water. In addition, microscopic studies using scanning electron microscope (SEM), transmission electron microscope (TEM), polarized optical microscope (POM), and confocal microscope revealed the size and structural morphology and mesophase changes of the aggregates. Overall, our comprehensive investigation has positioned azoisoxazolium salts as a new class of ionic photoswitches characterized by several intriguing properties and a pronounced tendency to aggregate. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Photochemistry & Photobiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/php.70056 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 653 Subjects: – SubjectFull: Photochromism Type: general – SubjectFull: Azo compounds Type: general – SubjectFull: Relaxation phenomena Type: general – SubjectFull: Fluorescence Type: general – SubjectFull: Microscopy Type: general – SubjectFull: Photoactivation Type: general Titles: – TitleFull: Photoswitching, aggregation, and negative photochromism in ionic arylazoisoxazolium photoswitches. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Parthiban, Gayathri – PersonEntity: Name: NameFull: Kumar, Himanshu – PersonEntity: Name: NameFull: Parambattummal, Anees Rahman – PersonEntity: Name: NameFull: Venkataramani, Sugumar IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May/Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00318655 Numbering: – Type: volume Value: 102 – Type: issue Value: 3 Titles: – TitleFull: Photochemistry & Photobiology Type: main |
| ResultId | 1 |
