Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSO
The photoredox reactions of biologically important phenols (p-coumaric acid, ferulic acid, thymol, quercetin and gallic acid) with the excited state [Ru(nbpy)3]2+ (nbpy = 4,4′-dinonyl-2,2′-bipyridine) complex proceed through photoinduced electron transfer reaction in DMSO and have been studied by lu...
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| Format: | Article |
| Language: | English |
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Elsevier
2017-05-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535213003031 |
| _version_ | 1818238763851055104 |
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| author | Daniel Sheeba Allen Gnana Raj George |
| author_facet | Daniel Sheeba Allen Gnana Raj George |
| author_sort | Daniel Sheeba |
| collection | DOAJ |
| description | The photoredox reactions of biologically important phenols (p-coumaric acid, ferulic acid, thymol, quercetin and gallic acid) with the excited state [Ru(nbpy)3]2+ (nbpy = 4,4′-dinonyl-2,2′-bipyridine) complex proceed through photoinduced electron transfer reaction in DMSO and have been studied by luminescence quenching technique. The complex shows absorption and emission maximum at 457 and 628 nm and it shows a lifetime of 804 ns in DMSO. The excited state reduction potential of the complex ERu2+∗/+0 in DMSO is 0.72 V vs Ag/Ag+. The dynamic nature of quenching is confirmed from the ground state absorption studies. The reductive quenching of [Ru(nbpy)3]2+ by phenolate ions has been confirmed from transient absorption spectra and from the linear variation of logkq vs oxidation potential of the phenols. The quenching rate constant, (kq) is highly sensitive to the availability of active phenolate ions, oxidation potential of the polyphenols, the free energy change (ΔG0) of the reaction and to the electron transfer distance between the complex and the quencher. Structural effects seem to play an important role in the photoinduced electron transfer reactions in DMSO. |
| first_indexed | 2024-12-12T12:46:50Z |
| format | Article |
| id | doaj.art-5b47f39863dc4d6ca1f12e6d887a5b57 |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-12-12T12:46:50Z |
| publishDate | 2017-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-5b47f39863dc4d6ca1f12e6d887a5b572022-12-22T00:24:06ZengElsevierArabian Journal of Chemistry1878-53522017-05-0110S2S2429S243510.1016/j.arabjc.2013.09.006Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSODaniel SheebaAllen Gnana Raj GeorgeThe photoredox reactions of biologically important phenols (p-coumaric acid, ferulic acid, thymol, quercetin and gallic acid) with the excited state [Ru(nbpy)3]2+ (nbpy = 4,4′-dinonyl-2,2′-bipyridine) complex proceed through photoinduced electron transfer reaction in DMSO and have been studied by luminescence quenching technique. The complex shows absorption and emission maximum at 457 and 628 nm and it shows a lifetime of 804 ns in DMSO. The excited state reduction potential of the complex ERu2+∗/+0 in DMSO is 0.72 V vs Ag/Ag+. The dynamic nature of quenching is confirmed from the ground state absorption studies. The reductive quenching of [Ru(nbpy)3]2+ by phenolate ions has been confirmed from transient absorption spectra and from the linear variation of logkq vs oxidation potential of the phenols. The quenching rate constant, (kq) is highly sensitive to the availability of active phenolate ions, oxidation potential of the polyphenols, the free energy change (ΔG0) of the reaction and to the electron transfer distance between the complex and the quencher. Structural effects seem to play an important role in the photoinduced electron transfer reactions in DMSO.http://www.sciencedirect.com/science/article/pii/S1878535213003031Luminescence quenchingStern–Volmer equationPhotooxidation of phenolsPhotoinduced electron transferStructural effects |
| spellingShingle | Daniel Sheeba Allen Gnana Raj George Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSO Arabian Journal of Chemistry Luminescence quenching Stern–Volmer equation Photooxidation of phenols Photoinduced electron transfer Structural effects |
| title | Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSO |
| title_full | Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSO |
| title_fullStr | Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSO |
| title_full_unstemmed | Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSO |
| title_short | Luminescence quenching of tris(4,4′-dinonyl-2,2′-bipyridyl) ruthenium(II) cation with phenolate ions in DMSO |
| title_sort | luminescence quenching of tris 4 4 dinonyl 2 2 bipyridyl ruthenium ii cation with phenolate ions in dmso |
| topic | Luminescence quenching Stern–Volmer equation Photooxidation of phenols Photoinduced electron transfer Structural effects |
| url | http://www.sciencedirect.com/science/article/pii/S1878535213003031 |
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