An aggregation-induced emission-active bis-heteroleptic ruthenium(ii ) complex of thiophenyl substituted phenanthroline for the selective 'turn-off' detection of picric acid
| Autor: | Sumit Kumar Patra, Monosh Rabha, Snehadrinarayan Khatua, Bhaskar Sen |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | New Journal of Chemistry. 46:169-177 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/d1nj04798a |
| Popis: | The development of metal complex-based aggregation-induced emission (AIE) active materials is of great importance and a challenging task. We have designed and successfully synthesized a new bis-heteroleptic ruthenium(II) polypyridine complex, Ru-1 of a thiophenol substituted 1,10-phenanthroline based ligand (L1). The solution structure of Ru-1 was fully characterized by 1D (1H, 13C) and 2D (1H-1H COSY, 1H-13C HSQC, and 1H-13C HMBC) NMR spectroscopy, and ESI-MS. Ru-1 shows aggregation-induced emission (AIE) enhancement in water and highly dense polyethylene glycol (PEG) media supported by DLS, SEM, and TEM studies. The complex, Ru-1, is weakly luminescent in acetonitrile, and a very bright luminescence of Ru-1 in the weakly soluble water and high dense PEG media arise due to the formation of nanoaggregates and the restricted intramolecular motion (RIM). The probe in aqueous acetonitrile solution (7:3; v/v) is able to selectively and sensitively detect Picric Acid (PA) over other competitive nitroaromatic compounds through the luminescence quenching. The limit of detection (LOD) signifies that Ru-1 is capable of detecting picric acid at the micromolar level. Theoretical calculations were carried out to assign electronic transitions in Ru-1, both the ground and excited state. Further, a paper strip kit with Ru-1 has been constructed for the practical application and in-field detection of picric acid without any interference of other nitroaromatic analytes. |
| Databáze: | OpenAIRE |
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