Photochemistry of aryl halides: Photodissociation dynamics

Han, Keli; He, Guo‐Zhong

doi:10.1016/j.jphotochemrev.2007.03.002

Cited by 259 publications

(49 citation statements)

References 100 publications

(173 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[45] Neutral aryl halides have been extensively studied and the photodissociation dynamics of many systems have been reported. [46][47][48][49][50][51][52] The photo-induced cleavage of the carbon-halogen bond occurs under UV-excitation as the system accesses dissociative electronic states. These dissociative states are rationalized by the excitation of electrons from non-bonding (n) orbitals on the halogen to anti-bonding σ* orbitals localized around the carbon-halogen bond (σ*←n).…”

Section: Resultsmentioning

confidence: 99%

UV Photodissociation Action Spectroscopy of Haloanilinium Ions in a Linear Quadrupole Ion Trap Mass Spectrometer

Hansen

Kirk

Blanksby

et al. 2013

J. Am. Soc. Mass Spectrom.

View full text Add to dashboard Cite

. (2013). UV photodissociation action spectroscopy of haloanilinium ions in a linear quadrupole ion trap mass spectrometer. Journal of the American Society for Mass Spectrometry, 24 (6), 932-940. UV photodissociation action spectroscopy of haloanilinium ions in a linear quadrupole ion trap mass spectrometer Abstract UV-vis photodissociation action spectroscopy is becoming increasingly prevalent because of advances in, and commercial availability of, ion trapping technologies and tunable laser sources. This study outlines in detail an instrumental arrangement, combining a commercial ion-trap mass spectrometer and tunable nanosecond pulsed laser source, for performing fully automated photodissociation action spectroscopy on gas-phase ions. The components of the instrumentation are outlined, including the optical and electronic interfacing, in addition to the control software for automating the experiment and performing online analysis of the spectra. To demonstrate the utility of this ensemble, the photodissociation action spectra of 4-chloroanilinium, 4-bromoanilinium, and 4-iodoanilinium cations are presented and discussed. Multiple photoproducts are detected in each case and the photoproduct yields are followed as a function of laser wavelength. It is shown that the wavelength-dependent partitioning of the halide loss, H loss, and NH3 loss channels can be broadly rationalized in terms of the relative carbon-halide bond dissociation energies and processes of energy redistribution. The photodissociation action spectrum of (phenyl)Ag2 + is compared with a literature spectrum as a further benchmark. AbstractUV-Vis photodissociation action spectroscopy is becoming increasingly prevalent due to advances in, and commercial availability of, ion trapping technologies and tunable laser sources. This study outlines in detail an instrumental arrangement, combining a commercial ion-trap mass spectrometer and tunable nanosecond pulsed laser source, for performing fully automated photodissociation action spectroscopy on gas-phase ions. The components of the instrumentation are outlined, including the optical and electronic interfacing, in addition to the control software for automating the experiment and performing online analysis of the spectra. To demonstrate the utility of this ensemble, the photodissociation action spectra of 4-chloroanilinium, 4-bromoanilinium and 4-iodoanilinium cations are presented and discussed. Multiple photoproducts are detected in each case and the photoproduct yields are followed as a function of laser wavelength. It is shown that the wavelength-dependent partitioning of the halide loss, H loss and NH 3 loss channels can be broadly rationalized in terms of the relative carbon-halide bond dissociation energies and processes of energy redistribution. The photodissociation action spectrum of (phenyl)Ag 2 + is compared to a literature spectrum as a further benchmark.3

show abstract

Section: Resultsmentioning

confidence: 99%

UV Photodissociation Action Spectroscopy of Haloanilinium Ions in a Linear Quadrupole Ion Trap Mass Spectrometer

Hansen

Kirk

Blanksby

et al. 2013

J. Am. Soc. Mass Spectrom.

View full text Add to dashboard Cite

show abstract

“…The time-dependent wave function φ(x,t) is propagated using the standard second-order split-operator method [29][30][31]. The synthesized laser field is expressed as…”

Section: Computational Aspectsmentioning

confidence: 99%

Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effects

2011

View full text Add to dashboard Cite

In this paper, we theoretically discuss the combined chirp effects on the isolated attosecond generation when a model Ar is exposed to an intense 5-fs, 800-nm fundamental chirped pulse combined with a weak 10-fs, 1200-nm controlling chirped pulse. It shows that for the case of the chirp parameters β 1 = 6.1 (corresponding to the 800-nm field) and β 2 = 4.0 (corresponding to the 1200-nm field), both the harmonic cutoff energy and the supercontinuum can be remarkably extended resulting in a 663-eV bandwidth. Moreover, due to the introduction of the chirps, the short quantum path is selected to contribute to the harmonic spectrum. Finally, by superposing a properly selected harmonic spectrum in the supercontinuum region, an isolated pulse as short as 31 as (5 as) is generated without (with) phase compensation.

show abstract

“…Experiments performed using the femtosecond time-resolved vibrational spectroscopy have shown the potential to monitor hydrogen-bonding dynamics. Hydrogen-bonding dynamics always occurs on ultrafast timescales, which plays an increasingly important role in many photophysical processes and photochemical reactions [41][42][43][44][45][46][47][48][49][50][51][52][53]. It has been confirmed by Zhao et al that the intermolecular hydrogen bond in many molecular systems is greatly strengthened in the electronically excited state.…”

Section: Introductionmentioning

confidence: 95%

Hydrogen-bonding study of photoexcited 4-nitro-1,8-naphthalimide in hydrogen-donating solvents

et al. 2016

View full text Add to dashboard Cite

Abstract:The solute-solvent interactions of 4-nitro-1,8-naphthalimide (4NNI) as a hydrogen bond acceptor in hydrogen donating methanol (MeOH) solvent in electronic excited states were investigated by means of the timedependent density functional theory(TDDFT). We calculated the S 0 state geometry optimizations, electronic transition energies and corresponding oscillation strengths of the low-lying electronically excited states for the isolated 4NNi and hydrogen-bonded 4NNi-(MeOH) 1,4 complexes using the density functional theory (DFT) and TDDFT methods. The electronic excitation energies of the hydrogen-bonded complexes are correspondingly decreased compared to that of the isolated 4NNi, which revealed that the intermolecular hydrogen bond C=O· · · H-O and N=O· · · H-O in the hydrogen-bonded 4NNi-(MeOH) 1,4 are strengthened in the electronically excited state. The calculated results are consistent with the mechanism that hydrogen bond strengthening will induce a redshift of the corresponding electronic spectra, while hydrogen bond weakening will cause a blueshift. Furthermore, we believe that the deduction we used to depict the trend of the hydrogen bond changes in excited states exists in many other fluorescent dyes in solution.

show abstract

Photochemistry of aryl halides: Photodissociation dynamics

Cited by 259 publications

References 100 publications

UV Photodissociation Action Spectroscopy of Haloanilinium Ions in a Linear Quadrupole Ion Trap Mass Spectrometer

UV Photodissociation Action Spectroscopy of Haloanilinium Ions in a Linear Quadrupole Ion Trap Mass Spectrometer

Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effects

Hydrogen-bonding study of photoexcited 4-nitro-1,8-naphthalimide in hydrogen-donating solvents

Contact Info

Product

Resources

About