Ultraviolet photoelectron studies of methyl substituted crysenes

Shahbaz, M.; Akiyama, I.; Lebreton, Pierre

doi:10.1016/0006-291x(81)91655-7

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…Perylene (Figure i) has the highest photoionization cross section near 7.5 eV of all five curves presented in Figure f–j. This result is consistent with the low ionization threshold of perylene (6.96 eV) compared to those of the four other PAH species: pyrene, 7.43 eV; fluoranthene, 7.9 eV; chrysene, 7.60 eV; and coronene, 7.29 eV …”

Section: Resultssupporting

confidence: 86%

“…Perylene (Figure 3i) has the highest photoionization cross section near 7.5 eV of all five curves presented in Figure 3f−j. This result is consistent with the low ionization threshold of perylene (6.96 eV) 43 compared to those of the four other PAH species: pyrene, 7.43 eV; 44 fluoranthene, 7.9 eV; 41 chrysene, 7.60 eV; 45 and coronene, 7.29 eV. 46 Our pyrene measurements showed a dip in the photoionization cross-section curve between 8.5 and 9 eV.…”

Section: ■ Results and Discussionsupporting

confidence: 85%

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Photoionization Efficiencies of Five Polycyclic Aromatic Hydrocarbons

et al. 2017

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We have measured photoionization-efficiency curves for pyrene, fluoranthene, chrysene, perylene, and coronene in the photon energy range of 7.5-10.2 eV and derived their photoionization cross-section curves in this energy range. All measurements were performed using tunable vacuum ultraviolet (VUV) radiation generated at the Advanced Light Source synchrotron at Lawrence Berkeley National Laboratory. The VUV radiation was used for photoionization, and detection was performed using a time-of-flight mass spectrometer. We measured the photoionization efficiency of 2,5-dimethylfuran simultaneously with those of pyrene, fluoranthene, chrysene, perylene, and coronene to obtain references of the photon flux during each measurement from the known photoionization cross-section curve of 2,5-dimethylfuran.

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Section: Resultssupporting

confidence: 86%

Section: ■ Results and Discussionsupporting

confidence: 85%

Photoionization Efficiencies of Five Polycyclic Aromatic Hydrocarbons

et al. 2017

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“…We also listed the calculated adiabatic ionization potentials (IP A ) of the arene monomers and dimers in Table 1. The IP A (ArH) values are very close to those determined experimentally,21–23 thus demonstrating the reliability of our calculated IP V and IP A values. Although the IP A (ArH) and IP A [(ArH) 2 ] values also gave an excellent Mulliken plot with the E ( λ max ) values of the LEBs and HEBs (see the Supporting Information), we used IP V values in Figures 3 and 5, in compliance with the Mulliken CT theory 17…”

Section: Ipv and Ipa Values Of Monomeric And Dimeric Arenes And Energsupporting

confidence: 85%

1:1 and 2:1 Charge‐Transfer Complexes between Aromatic Hydrocarbons and Dry Titanium Dioxide

Seo

Lee

et al. 2005

Angewandte Chemie

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The unique properties of TiO 2 have made it a popular material for various extensive applications in, for example, solar cells, [1] water splitting, [2] water treatment, [3] photocatalysts, [4,5] superhydrophilic coatings, [5] sensors, [6] and batteries. [7] Since the first step in these applications involves the interaction between the TiO 2 surface and the adsorbate, understanding the nature of the interactions at the interface is essential for understanding the known properties and for exploring new applications.Two types of interactions have been observed so far: coordinative covalent bonding (CCB) [8][9][10][11][12][13][14][15] between the adsorbates and the Ti IV ions on TiO 2 surfaces and the physical adsorption (PA). The CCB-type interactions give rise to ligand-to-metal charge-transfer (LMCT) interactions between the adsorbates and Ti IV ions, owing to the low-lying empty t 2g orbitals of the Ti IV centers in octahedral environments. Indeed, those relatively electron-rich adsorbates having functional groups such as enediol (notably catechol, [8] ascorbic acid, [9] dopamine, [10] and alizarin [8c] ), carboxylate (notably 4-(methylsulfanyl)benzoic acid [11] and sulfanylacetic acid [12] ), nitrile (notably ferricyanide [13] ), and alcohol (notably 4-hydroxybiphenyl [14] ) groups display LMCT bands in the visible region. The less electron-rich adsorbates such as thiocyanate showed the corresponding LMCT band in the UV region. [15] In contrast to the well-studied CCB-type interaction, however, nothing is known about the nature of interaction between the physically adsorbed molecules and TiO 2 . Stemming from our interests on the charge-transfer (CT) interactions between the zeolite framework and intercalated guest molecules, [16] we have conducted a series of experiments to study the interaction between TiO 2 and the adsorbates. As a result, we have discovered that pure polycyclic hydrocarbon arenes (ArHs) readily form 1:1 and 2:1 CT complexes with dry TiO 2 surfaces.When dry TiO 2 (anatase, average diameter = 50 nm) particles were suspended in dilute CH 2 Cl 2 solutions of phenanthrene (1), chrysene (2), anthracene (3), pyrene (4), and benzo[a]pyrene (5, Figure 1) in a dry box, the TiO 2 particles immediately picked up pale brownish colors. The added amounts of ArHs correspond to 2-20 % surface coverage of TiO 2 based on the monomeric forms. Upon removal of the solvent by evacuation in the dry box, the colors intensified significantly. The colored TiO 2 particles bleached back to colorless when they were washed with CH 2 Cl 2 , and the UV/Vis spectra of the rinses were identical to those of the pure ArHs (see the Supporting Information), indicating that the color generation is a reversible process, and the coloration is not the result of the degradation of the ArHs upon contact with TiO 2 . On the contrary, coloration did not occur with dried SiO 2 and BaSO 4 , emphasizing that the coloration is unique to TiO 2 . The diffuse reflectance spectra of the colored, dry TiO 2 particles revealed the presence of...

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“…This result is shown in Figure 3.5 and clearly points out how the ionization efficiency of benzo(a)anthracene is significantly higher than the one of chrysene (p < 0.05) in both ionization sources, but most prevalently in APPI. This trend can be explained, similarly to the methylation trend, by looking at the ionization energies of the two compounds (7.60 ± 0.03 eV for chrysene (Shahbaz et al, 1981), and 7.46 ± 0.03 eV for benzo(a)anthracene ). An additional interesting aspect of ionization differences for isomeric compounds illustrated in Figure 3.5, is the clear dissimilarity in the extent of protonation of the two compounds.…”

Section: Total Ionization Efficiencies Of Major Compound Classesmentioning

confidence: 71%

Going Beyond the Analysis of Common Contaminants: Target, Suspect, and Non-Target Analysis of Complex Environmental Matrices by High-Resolution Mass Spectrometry

Huba¹

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Ultraviolet photoelectron studies of methyl substituted crysenes

Cited by 13 publications

References 10 publications

Photoionization Efficiencies of Five Polycyclic Aromatic Hydrocarbons

Photoionization Efficiencies of Five Polycyclic Aromatic Hydrocarbons

1:1 and 2:1 Charge‐Transfer Complexes between Aromatic Hydrocarbons and Dry Titanium Dioxide

Going Beyond the Analysis of Common Contaminants: Target, Suspect, and Non-Target Analysis of Complex Environmental Matrices by High-Resolution Mass Spectrometry

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