Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical Dissolution
Reflectance anisotropy spectroscopy (RAS) coupled to an electrochemical cell represents a powerful tool to correlate changes in the surface optical anisotropy to changes in the electrochemical currents related to electrochemical reactions. The high sensitivity of RAS in the range of the absorption b...
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MDPI AG
2022-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/22/8010 |
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| author | Rossella Yivlialin Claudia Filoni Francesco Goto Alberto Calloni Lamberto Duò Franco Ciccacci Gianlorenzo Bussetti |
| author_facet | Rossella Yivlialin Claudia Filoni Francesco Goto Alberto Calloni Lamberto Duò Franco Ciccacci Gianlorenzo Bussetti |
| author_sort | Rossella Yivlialin |
| collection | DOAJ |
| description | Reflectance anisotropy spectroscopy (RAS) coupled to an electrochemical cell represents a powerful tool to correlate changes in the surface optical anisotropy to changes in the electrochemical currents related to electrochemical reactions. The high sensitivity of RAS in the range of the absorption bands of organic systems, such as porphyrins, allows us to directly correlate the variations of the optical anisotropy signal to modifications in the solid-state aggregation of the porphyrin molecules. By combining in situ RAS to electrochemical techniques, we studied the case of vacuum-deposited porphyrin nanocrystals, which have been recently observed dissolving through electrochemical oxidation in diluted sulfuric acid. Specifically, we could identify the first stages of the morphological modifications of the nanocrystals, which we could attribute to the single-electron transfers involved in the oxidation reaction; in this sense, the simultaneous variation of the optical anisotropy with the electron transfer acts as a precursor of the dissolution process of porphyrin nanocrystals. |
| first_indexed | 2024-03-09T18:06:58Z |
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| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T18:06:58Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-746a9c02f5c54787bbdf75441fdcbfde2023-11-24T09:24:57ZengMDPI AGMolecules1420-30492022-11-012722801010.3390/molecules27228010Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical DissolutionRossella Yivlialin0Claudia Filoni1Francesco Goto2Alberto Calloni3Lamberto Duò4Franco Ciccacci5Gianlorenzo Bussetti6Department of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, ItalyDepartment of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, ItalyDepartment of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, ItalyDepartment of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, ItalyDepartment of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, ItalyDepartment of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, ItalyDepartment of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, ItalyReflectance anisotropy spectroscopy (RAS) coupled to an electrochemical cell represents a powerful tool to correlate changes in the surface optical anisotropy to changes in the electrochemical currents related to electrochemical reactions. The high sensitivity of RAS in the range of the absorption bands of organic systems, such as porphyrins, allows us to directly correlate the variations of the optical anisotropy signal to modifications in the solid-state aggregation of the porphyrin molecules. By combining in situ RAS to electrochemical techniques, we studied the case of vacuum-deposited porphyrin nanocrystals, which have been recently observed dissolving through electrochemical oxidation in diluted sulfuric acid. Specifically, we could identify the first stages of the morphological modifications of the nanocrystals, which we could attribute to the single-electron transfers involved in the oxidation reaction; in this sense, the simultaneous variation of the optical anisotropy with the electron transfer acts as a precursor of the dissolution process of porphyrin nanocrystals.https://www.mdpi.com/1420-3049/27/22/8010reflectance spectroscopyporphyrindissolutionorganic crystalscyclic voltammetryAFM |
| spellingShingle | Rossella Yivlialin Claudia Filoni Francesco Goto Alberto Calloni Lamberto Duò Franco Ciccacci Gianlorenzo Bussetti Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical Dissolution Molecules reflectance spectroscopy porphyrin dissolution organic crystals cyclic voltammetry AFM |
| title | Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical Dissolution |
| title_full | Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical Dissolution |
| title_fullStr | Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical Dissolution |
| title_full_unstemmed | Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical Dissolution |
| title_short | Optical Anisotropy of Porphyrin Nanocrystals Modified by the Electrochemical Dissolution |
| title_sort | optical anisotropy of porphyrin nanocrystals modified by the electrochemical dissolution |
| topic | reflectance spectroscopy porphyrin dissolution organic crystals cyclic voltammetry AFM |
| url | https://www.mdpi.com/1420-3049/27/22/8010 |
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