Excited State Dynamics of Alizarin Red S Nanoparticles in Solution
Alizarin red S is a sulfonated, water-soluble derivative of alizarin. This work presents femtosecond studies of alizarin red S (ARS) nanoparticles in comparison to ARS in aqueous solution and to alizarin in DMSO. The femtosecond studies cover a probing spectral range of 350–750 nm using different ex...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/15/5633 |
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| author | Pascal Rauthe Kristina Sabljo Maike Kristin Vogelbacher Claus Feldmann Andreas-Neil Unterreiner |
| author_facet | Pascal Rauthe Kristina Sabljo Maike Kristin Vogelbacher Claus Feldmann Andreas-Neil Unterreiner |
| author_sort | Pascal Rauthe |
| collection | DOAJ |
| description | Alizarin red S is a sulfonated, water-soluble derivative of alizarin. This work presents femtosecond studies of alizarin red S (ARS) nanoparticles in comparison to ARS in aqueous solution and to alizarin in DMSO. The femtosecond studies cover a probing spectral range of 350–750 nm using different excitation wavelengths, taking into account the variation of the absorption spectra with the pH values of the solvent. Stationary absorption spectra show slight differences between solution and nanoparticles. Excitation at 530 nm results in low and noisy responses, therefore, we additionally recorded transient spectra of the nanoparticles at λ<sub>ex</sub> = 267 nm. While the results in DMSO are comparable to previous studies in non-aqueous solvents, we report a relatively fast relaxation of 14 ps in [La(OH)<sub>2</sub>][ARS] nanoparticles in aqueous solution after excitation at 530 nm, which is similar to Na(ARS) solution (19 ps). The dynamics changed with lower pH, but still without significant differences between nanoparticles and solution. We propose [La(OH)<sub>2</sub>][ARS] nanoparticles as a suitable alternative to dissolved molecules with similar spectroscopic properties, for example, with regard to biomarker applications. |
| first_indexed | 2024-03-11T00:22:03Z |
| format | Article |
| id | doaj.art-0592e827604f43b296dcab533d3692ab |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T00:22:03Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-0592e827604f43b296dcab533d3692ab2023-11-18T23:16:49ZengMDPI AGMolecules1420-30492023-07-012815563310.3390/molecules28155633Excited State Dynamics of Alizarin Red S Nanoparticles in SolutionPascal Rauthe0Kristina Sabljo1Maike Kristin Vogelbacher2Claus Feldmann3Andreas-Neil Unterreiner4Institute of Physical Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, GermanyInstitute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, GermanyInstitute of Physical Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, GermanyInstitute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, GermanyInstitute of Physical Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, GermanyAlizarin red S is a sulfonated, water-soluble derivative of alizarin. This work presents femtosecond studies of alizarin red S (ARS) nanoparticles in comparison to ARS in aqueous solution and to alizarin in DMSO. The femtosecond studies cover a probing spectral range of 350–750 nm using different excitation wavelengths, taking into account the variation of the absorption spectra with the pH values of the solvent. Stationary absorption spectra show slight differences between solution and nanoparticles. Excitation at 530 nm results in low and noisy responses, therefore, we additionally recorded transient spectra of the nanoparticles at λ<sub>ex</sub> = 267 nm. While the results in DMSO are comparable to previous studies in non-aqueous solvents, we report a relatively fast relaxation of 14 ps in [La(OH)<sub>2</sub>][ARS] nanoparticles in aqueous solution after excitation at 530 nm, which is similar to Na(ARS) solution (19 ps). The dynamics changed with lower pH, but still without significant differences between nanoparticles and solution. We propose [La(OH)<sub>2</sub>][ARS] nanoparticles as a suitable alternative to dissolved molecules with similar spectroscopic properties, for example, with regard to biomarker applications.https://www.mdpi.com/1420-3049/28/15/5633alizarin red Snanoparticlesaqueous solutionfemtosecondpH dependence |
| spellingShingle | Pascal Rauthe Kristina Sabljo Maike Kristin Vogelbacher Claus Feldmann Andreas-Neil Unterreiner Excited State Dynamics of Alizarin Red S Nanoparticles in Solution Molecules alizarin red S nanoparticles aqueous solution femtosecond pH dependence |
| title | Excited State Dynamics of Alizarin Red S Nanoparticles in Solution |
| title_full | Excited State Dynamics of Alizarin Red S Nanoparticles in Solution |
| title_fullStr | Excited State Dynamics of Alizarin Red S Nanoparticles in Solution |
| title_full_unstemmed | Excited State Dynamics of Alizarin Red S Nanoparticles in Solution |
| title_short | Excited State Dynamics of Alizarin Red S Nanoparticles in Solution |
| title_sort | excited state dynamics of alizarin red s nanoparticles in solution |
| topic | alizarin red S nanoparticles aqueous solution femtosecond pH dependence |
| url | https://www.mdpi.com/1420-3049/28/15/5633 |
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