| Autor: |
Adela F. Dobre, Augustin M. Mădălan, Anamaria Hanganu, Petre Ionita |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Chemistry, Vol 6, Iss 5, Pp 899-910 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2624-8549 |
| DOI: |
10.3390/chemistry6050052 |
| Popis: |
Starting from the well known stable free radical DPPH (or its reduced counterpart, 2,2-diphenyl-1-picryl-hydrazine) and several amino derivatives, novel zwitterionic compounds (diazenium betaines) were obtained and characterized by different means, like NMR, IR, MS, and UV–Vis. These betaines are highly intense blue-colored compounds that can be easily reduced by ascorbic acid (vitamin C) or sodium ascorbate to their corresponding para-phenyl substituted derivatives of DPPH, which have a yellow color. Most of such redox processes were found to be reversible. However, the oxidation of 2-p-aminophenyl-2-phenyl-1-picryl-hydrazine led to an azo-derivative of DPPH diradical, and its structure was unveiled by X-ray monocrystal diffraction. Possible diradicaloid behavior is also discussed. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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