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TiO2-Acetylacetone as an Efficient Source of Superoxide Radicals under Reduced Power Visible Light: Photocatalytic Degradation of Chlorophenol and Tetracycline. Catalysts 2022. [DOI: 10.3390/catal12020116] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Visible light-sensitive TiO2-based nanomaterials are widely investigated for photocatalytic applications under high power (≥300 W) UV and visible light. The formation of charge transfer complexes (CTCs) between bidentate ligands and nanocrystalline TiO2 promotes visible light absorption and constitutes a promising alternative for environmental remediation under reduced visible light power. However, the efficiency of photodegradation, the volatilization profile of bidentates, and the role of reactive oxidizing species (ROS) are not fully understood. In this study, thermogravimetric analyses coupled with mass spectroscopy (TGA-MS) were performed on TiO2-Acetylacetone (ACAC) CTC. TiO2-ACAC CTC calcined at 300 °C (TiO2-A300) was applied for the photocatalytic degradation of chlorophenol (4-CP) and tetracycline (TC) under low power visible light (26 W). Furthermore, the ROS scavengers isopropanol and benzoquinone were added for studying the photocatalytic role of •OH and •O2− radicals. The TGA-MS showed the release of ACAC fragments, such as ethyl ions and acetone, in the range between 150 °C and 265 °C, while between 300 °C and 450 °C only CO2 and H2O were released during oxidation of ACAC. The photocatalytic abatement of tetracycline (68.6%), performed by TiO2-A300, was ~two times higher than that observed for chlorophenol (31.3%) after 6 h, indicating a distinct participation of ROS in the degradation of these pollutants. The addition of the ROS scavenger revealed •O2− radicals as primarily responsible for the high efficiency of TiO2-ACAC CTC under reduced visible light. On the other hand, the •OH radicals are not efficiently generated in the CTC. Therefore, the development of heterostructures based on TiO2-ACAC CTC can increase the generation of ROS through coupling with semiconductors capable of generating •OH under visible light.
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Belova NV, Girichev GV, Oberhammer H, Hoang TN, Shlykov SA. Tautomeric and Conformational Properties of Benzoylacetone, CH3–C(O)–CH2–C(O)–C6H5: Gas-Phase Electron Diffraction and Quantum Chemical Study. J Phys Chem A 2012; 116:3428-35. [DOI: 10.1021/jp2118967] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Natalya V. Belova
- Ivanovo State University of Chemistry and Technology, Engelsa av., 7, Ivanovo
153460, Russia
| | - Georgiy V. Girichev
- Ivanovo State University of Chemistry and Technology, Engelsa av., 7, Ivanovo
153460, Russia
| | - Heinz Oberhammer
- Institut für Physikalische
und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany
| | - Trang Nguen Hoang
- Ivanovo State University of Chemistry and Technology, Engelsa av., 7, Ivanovo
153460, Russia
| | - Sergey A. Shlykov
- Ivanovo State University of Chemistry and Technology, Engelsa av., 7, Ivanovo
153460, Russia
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Tautomeric and conformational properties of dibenzoylmethane, C6H5–C(O)–CH2–C(O)–C6H5: gas-phase electron diffraction and quantum chemical study. Struct Chem 2010. [DOI: 10.1007/s11224-010-9687-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vandewalle M, Schamp N, De Wilde H. Studies in Organic Mass Spectrometry III 1, 3-Cyclohexanediones. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19670760112] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Schamp N, Vandewalle M, Francque M. Studies in Organic Mass Spectrometry. V (1): Keto-enol tautomerism in mass spectrometry. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19670760905] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Cant E, Maenhaut-Claeys M, Francque M, Vandewalle M. Studies in organic mass spectrometry. XVII The fragmentation of methyl enol ethers of 1,3-cyclohexanediones and 1,3-cyclopentanediones. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19740830111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Vandewalle M, Schamp N, De Wilde H. Studies in Organic Mass Spectrometry IV. Fragmentation of 2-Alkyl- 1, 3-cyclohexanediones. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19670760113] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Furlong JJP, Schiavoni MM, Castro EA, Allegretti PE. Mass spectrometry as a tool for studying tautomerism. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2009. [DOI: 10.1134/s1070428008120014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Martiskainen O, Kivelä H, Matosiuk D, Szacon E, Rzadkowska M, Pihlaja K. Electron ionization mass spectra of aryl- and benzyl-substituted 2,3-dihydroimidazo[1,2-a]pyrimidine-5,7(1H,6H)-diones. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:3891-3897. [PMID: 17979102 DOI: 10.1002/rcm.3281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The electron ionization mass spectra of the 1-phenyl-, 1-benzyl- and 6-benzyl-1-phenyl-2,3-dihydroimidazo[1,2-a]pyrimidine-5,7(1H,6H)-dione derivatives were recorded at 70 eV to find out the effects of substituents on their fragmentations. Fragmentation pathways were studied using B/E and B(2)/E scans. Some fragmentations involved the loss of C(3)HO(2) or carbon suboxide. The possibility of keto-enol tautomerism was also studied. For comparison selected compounds were studied using (1)H and (13)C NMR spectroscopy to reveal the presence of possible tautomerism. Some ions including [M-OH](+) and [M-HCO](+) and NMR results indicate that the enol form is predominant both in the gas and in the liquid phase.
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Affiliation(s)
- Olli Martiskainen
- Department of Chemistry, University of Turku, FI-20014 Turku, Finland
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11
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Zhao Y, Feng J, Chen G, Ke Y. Study on the Tautomer Interconversion of 3-Oxo Pentanoate During Gas Chromatography. Chromatographia 2006. [DOI: 10.1365/s10337-005-0710-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Terent'ev PB, Kalandarishvili AG. Application of mass spectrometry for the analysis of organic tautomeric compounds. MASS SPECTROMETRY REVIEWS 1996; 15:339-363. [PMID: 27082943 DOI: 10.1002/(sici)1098-2787(1996)15:6<339::aid-mas1>3.0.co;2-j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/1996] [Revised: 01/28/1997] [Accepted: 01/28/1997] [Indexed: 06/05/2023]
Abstract
Mass-spectral methods for the detection and identification of organic tautomers in the gas phase are reviewed together with the thermochemical and quantum chemical evidence for the stability of the respective tautomeric forms in the gas phase. The literature (approximately 150 references) is covered to 1995. © 1997 John Wiley & Sons, Inc., Mass Spectrom Rev 15(6), 339-363, 1997.
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Affiliation(s)
- P B Terent'ev
- Moscow State University, Leninskie Gory, Moscow, 119899, Russia
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Kuck D. Mass spectrometric fragmentation of isomeric 2-alkyl-substituted 1,3-indandiones and 3-alkylidenephthalides: a seven-step consecutive isomerization of regular and distonic molecular radical cations. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/oms.1210290302] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Tobita S, Tajima S, Suzuki S, Imamura T, Koyano I. Dissociation of ionized keto-enol tautomers of some 1,3-dicarbonyl compounds. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0168-1176(91)80074-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3-Methylnonane-2,4-dione – An Intense Odour Compound Formed during Flavour Reversion of Soya-Bean Oil. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/lipi.19890910604] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Grützmacher HF, Masur M. Loss of CO from the molecular ions of 2,2-dimethyl-3,5-hexandione. ACTA ACUST UNITED AC 1988. [DOI: 10.1002/oms.1210230313] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Masur M, Grützmacher HF, Münster H, Budzikiewicz H. Mass spectrometric fragmentation of the tautomers of 1,3-diketones. A gas chromatographic/mass spectrometric study. ACTA ACUST UNITED AC 1987. [DOI: 10.1002/oms.1210220804] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Mass spectrometric study of fluorinated ?-diketones. THEOR EXP CHEM+ 1985. [DOI: 10.1007/bf00945192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Pohjala EK, Nieminen AOK. Electron impact mass spectra of 2-(2-pyridyl)methylene-1,3-dicarbonyl compounds: Unusual abundance of the [M + 1]+ ion and the effect of stereochemistry. ACTA ACUST UNITED AC 1981. [DOI: 10.1002/oms.1210161203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Saint-Ruf G, Silou T. 2-Aminothiazole derivatives. I. Mass spectra of 2-acetylacetamidothiazoles andN-(2-thiazolyl)-β-(2′-thiazolylamino)crotonamides. J Heterocycl Chem 1977. [DOI: 10.1002/jhet.5570140530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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The formation of a resonance stabilized oxonium ion in isoflavone and 2′-substituted isoflavones. ACTA ACUST UNITED AC 1977. [DOI: 10.1002/oms.1210120114] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Schwarz H, Richter B, Bohlmann F. Massenspektrometrische Untersuchung ungesättigter Carbonylverbindungen: Radikal-eliminierung durch α-Spaltung oder Cyclisierung? ACTA ACUST UNITED AC 1975. [DOI: 10.1002/oms.1210101210] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Laćan M, Vukićević M, Džanić H, Stefanović D. The mass spectra of some aromatic polyketones. ACTA ACUST UNITED AC 1975. [DOI: 10.1002/oms.1210101014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Conrath K, Van Sande CD, Vandewalle M. Studies in organic mass spectrometry. XVI—A combined approach to the structures of ions generated from the molecular ions of acyclic β-diketones through loss of small neutral molecules. ACTA ACUST UNITED AC 1974. [DOI: 10.1002/oms.1210090607] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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30
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Kutney JP, Sanchez IH, Yee TH. Mass spectral fragmentation studies in usnic acid and related compounds. ACTA ACUST UNITED AC 1974. [DOI: 10.1002/oms.1210080117] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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31
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Cant E, Vandewalle M. Studies in organic mass spectrometry—IX: The fragmentation of alkylsubstituted 1,3-cyclopentanediones. ACTA ACUST UNITED AC 1971. [DOI: 10.1002/oms.1210051009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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Rubesch M, Clobes AL, Morris ML, Koob RD. Electron-impact induced fragmentation of partially fluorinated β-diketones. ACTA ACUST UNITED AC 1971. [DOI: 10.1002/oms.1210050302] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Porter Q, Ramsay C. Mass spectrometric studies—VII. Tetrahedron 1970. [DOI: 10.1016/s0040-4020(01)98742-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Nakata H, Tatematsu A. Mass spectrometry of tautomeric compounds—II: A mechanism of ketene elimination from enol acetates. ACTA ACUST UNITED AC 1970. [DOI: 10.1002/oms.1210040123] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ohashi M, Kamachi H, Kakisawa H, Tatematsu A, Yoshizumi H, Kano H, Nakata H. Mass spectra of some alkyl isoxazoles. ACTA ACUST UNITED AC 1969. [DOI: 10.1002/oms.1210020205] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Zamir L, Jensen BS, Larsen E. An investigation of tautomeric equilibria by means of mass spectrometry. ACTA ACUST UNITED AC 1969. [DOI: 10.1002/oms.1210020106] [Citation(s) in RCA: 49] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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39
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Mass spectral fragmentation of β-ketosulfoxides and β-ketosulfone. Neutral product stability as a driving force. Tetrahedron Lett 1969. [DOI: 10.1016/s0040-4039(01)88684-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lacey MJ, Macdonald CG, Shannon JS. The mass spectra of metal complexes of dibenzoylmethane. ACTA ACUST UNITED AC 1968. [DOI: 10.1002/oms.1210010111] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sasaki SI, Abe H, Nakanishi K, Itagaki Y, Watanabe E. Mass Spectrometric Studies of α, β-Epoxyketones. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1968. [DOI: 10.1246/bcsj.41.522] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Brown P, Djerassi C. Elektronenstoß-induzierte Umlagerungen organischer Moleküle. Angew Chem Int Ed Engl 1967. [DOI: 10.1002/ange.19670791102] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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