Excitation and Deexcitation of Benzene

Cundall, R. B.; Robinson, David; Pereira, L.C.

doi:10.1002/9780470133408.ch3

Cited by 10 publications

(2 citation statements)

References 234 publications

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“…In addition, we optimized the T 1 of 1, 2, 3, 4 and toluene (Figure ). The most significant difference between the optimized S 0 and the T 1 of 1, 2, 3 and 4 is that the carbon–carbon bonds in the aromatic ring are no longer equivalent; some of the bonds became longer and others shorter, as has been observed for the T 1 of benzene and toluene . The optimized structure of the T 1 of toluene is similar to what Cogan et al .…”

Section: Resultssupporting

confidence: 77%

Phenylethanol derivatives as triplet sensitizers for 1‐azidoadamantane

Ranaweera

Rajam

Guđmundsdóttir

2011

J of Physical Organic Chem

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Laser flash photolysis, phosphorescence and density functional calculations were used to characterize the triplet excited states of phenylethanol derivatives 1, 2, 3 and 4. In acetonitrile, the triplet excited states of these alcohols were formed with rate constants on the order of ~107 s–1 and decayed with rate constants between 105 and 106 s–1. The energies of these triplet excited states were between 80 and 83 kcal/mol. Furthermore, 3 can be used as a triplet sensitizer for alkyl azides to form triplet nitrene intermediates. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 77%

Phenylethanol derivatives as triplet sensitizers for 1‐azidoadamantane

Ranaweera

Rajam

Guđmundsdóttir

2011

J of Physical Organic Chem

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“…As shown in Figure , the emission spectra of aromatic compounds are different compared to those of alkanes and polar organic compounds. For aromatics, two new high-intensity peaks were observed at 353.9 and 369.8 nm, which are mainly dominated by the emission peaks of CH + in the 350 to 370 nm range. , Furthermore, the intensity of these two peaks gradually decreases from benzene to toluene to ethylbenzene, which indicates the presence of side-chain groups that negatively affect the emission of CH + . The peaks associated with CH (B 2 ∑ → X 2 Π) and CH (A 2 Δ → X 2 Π) at 390.8 and 432.0 nm were also recorded, and the peak at 390.8 nm is the highest peak in all three aromatic compounds.…”

Section: Resultsmentioning

confidence: 99%

Identification of Different Classes of VOCs Based on Optical Emission Spectra Using a Dielectric Barrier Helium Plasma Coupled with a Mini Spectrometer

Mao,

Atwa,

et al. 2024

ACS Meas. Sci. Au

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In this study, a micro helium dielectric barrier discharge (μHDBD) plasma device fabricated using 3D printing and molding techniques was coupled with a mini spectrometer to detect and identify different classes of volatile organic compounds (VOCs) using optical emission spectrometry (OES). We tested 11 VOCs belonging to three different classes (straight-chain alkanes, aromatics, and polar organic compounds). Our results clearly demonstrate that the optical emission spectra of different classes of VOCs show clear differences, and therefore, can be used for identification. Additionally, the emission spectra of VOCs with a similar structure (such as n-pentane, n-hexane, n-heptane, n-octane, and n-nonane) have similar optical emission spectrum shape. Acetone and ethanol also have similar emission wavelengths, but they show different line intensities for the same concentrations. We also found that the side-chain group of aromatics will also affect the emission spectra even though they have a similar structure (all have a benzene ring). Moreover, our μHDBD-OES system can also identify multiple compounds in VOC mixtures. Our work also demonstrates the possibility of identifying different classes of VOCs by the OES shape.

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