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Excited State Dynamics of Alizarin Red S Nanoparticles in Solution

Rauthe, Pascal 1; Sabljo, Kristina 2; Vogelbacher, Maike Kristin 1; Feldmann, Claus 2; Unterreiner, Andreas-Neil ORCID iD icon 1
1 Institut für Physikalische Chemie (IPC), Karlsruher Institut für Technologie (KIT)
2 Institut für Anorganische Chemie (AOC), Karlsruher Institut für Technologie (KIT)

Abstract:

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 $\lambda_{ex}$ = 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)$_2$][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)$_2$][ARS] nanoparticles as a suitable alternative to dissolved molecules with similar spectroscopic properties, for example, with regard to biomarker applications.


Verlagsausgabe §
DOI: 10.5445/IR/1000163485
Veröffentlicht am 26.10.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Anorganische Chemie (AOC)
Institut für Physikalische Chemie (IPC)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1420-3049
KITopen-ID: 1000163485
Erschienen in Molecules
Verlag MDPI
Band 28
Heft 15
Seiten Art.Nr.: 5633
Vorab online veröffentlicht am 25.07.2023
Schlagwörter alizarin red S, nanoparticles, aqueous solution, femtosecond. pH dependence
Nachgewiesen in Dimensions
Scopus
Web of Science
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