Knowledge Management System Of Shanghai Institute of Applied Physics, CAS
| Time-Resolved Spectroscopic Study of the Defluorination and Cyclization Reactions of Lomefloxacin in Water | |
| Su, T; Li, MD; Ma, J; Phillips, DL | |
| 2017 | |
| Source Publication | JOURNAL OF PHYSICAL CHEMISTRY B
 |
| ISSN | 1520-6106 |
| Volume | 121Issue:17Pages:4512-4520 |
| Subtype | 期刊论文 |
| Abstract | The mechanism of the defluorination reaction(s) of lomefloxacin (LF) upon light illumination was investigated by using ultrafast laser flash photolysis combined with transient resonance Raman spectroscopy in near neutral water solution. The zwitterionic configuration of LF was determined to be the main species present in the near neutral water solution and was the species that was photoexcited to initiate the photochemical reaction. Femtosecond transient absorption revealed that the first excited singlet state (S-1) of LF did not appreciably undergo intersystem crossing (ISC), and instead partially decayed to the ground state via fluorescence emission, and there was partial cleavage of the carbon fluorine bond at position 8 to produce a singlet LF aryl cation intermediate. The transient resonance Raman results provided a direct observation and vibrational spectral characterization of the singlet LF aryl cation species. Subsequently, the transformation from the singlet LF aryl cation to a triplet carbene via an ISC process was seen in nanosecond transient absorption spectra. Finally, the triplet carbene experienced a cyclization reaction with the N-ethyl chain to form a tricyclic product. |
| DOI | 10.1021/acs.jpcb.6b11267 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000400881300020 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.sinap.ac.cn/handle/331007/27487 |
| Collection | 中科院上海应用物理研究所2011-2018年 |
| Recommended Citation GB/T 7714 | Su, T,Li, MD,Ma, J,et al. Time-Resolved Spectroscopic Study of the Defluorination and Cyclization Reactions of Lomefloxacin in Water[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2017,121(17):4512-4520. |
| APA | Su, T,Li, MD,Ma, J,&Phillips, DL.(2017).Time-Resolved Spectroscopic Study of the Defluorination and Cyclization Reactions of Lomefloxacin in Water.JOURNAL OF PHYSICAL CHEMISTRY B,121(17),4512-4520. |
| MLA | Su, T,et al."Time-Resolved Spectroscopic Study of the Defluorination and Cyclization Reactions of Lomefloxacin in Water".JOURNAL OF PHYSICAL CHEMISTRY B 121.17(2017):4512-4520. |
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| Time-Resolved Spectr（2524KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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