Time-Resolved Photodissociations of Iodotoluene Radical Cations†

2002 ◽  
Vol 106 (42) ◽  
pp. 9918-9924 ◽  
Author(s):  
Byungjoo Kim ◽  
Seung Koo Shin
Keyword(s):  
Radical Cations ◽  
Time Resolved

scholarly journals Electron self-exchange activation parameters of diethyl sulfide and tetrahydrothiophene

2013 ◽  
Vol 9 ◽  
pp. 1448-1454
Author(s):  
Martin Goez ◽  
Martin Vogtherr
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Nuclear Polarization ◽  
Activation Barrier ◽  
Activation Parameters ◽  
Radical Cations ◽  
Free Energies ◽  
Time Resolved ◽  
Diethyl Sulfide ◽  
Chemically Induced

Electron transfer between the title compounds and their radical cations, which were generated by photoinduced electron transfer from the sulfides to excited 2,4,6-triphenylpyrylium cations, was investigated by time-resolved measurements of chemically induced dynamic nuclear polarization (CIDNP) in acetonitrile. The strongly negative activation entropies provide evidence for an associative–dissociative electron exchange involving dimeric radical cations. Despite this mechanistic complication, the free energies of activation were found to be well reproduced by the Marcus theory of electron transfer, with the activation barrier still dominated by solvent reorganization.

Detection of radical cations of group 14 element organometallics in alkane solutions using the method of time-resolved magnetic field effect

2003 ◽  
Vol 5 (10) ◽  
pp. 2027 ◽  
Author(s):  
V. I. Borovkov ◽  
V. A. Bagryansky ◽  
Yu. N. Molin ◽  
M. P. Egorov ◽  
O. M. Nefedov
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Radical Cations ◽  
Group 14 ◽  
Time Resolved

Structures of 4-substituted thioanisole radical cations studied by time-resolved resonance Raman spectroscopy during pulse radiolysis and theoretical calculations

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 109334-109339 ◽  
Author(s):  
Sachiko Tojo ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Raman Spectroscopy ◽  
Pulse Radiolysis ◽  
Dft Calculation ◽  
Theoretical Calculations ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Radical Cations ◽  
Time Resolved ◽  
Spin Distributions

The structures of 4-substituted thioanisole radical cations were studied by time-resolved resonance Raman spectroscopy during pulse radiolysis and DFT calculation, indicating importance of charge and spin distributions toward the dimerization.

Radical cations of n-alkanes in irradiated solutions as studied by time-resolved magnetic field effects

2002 ◽  
Vol 100 (9) ◽  
pp. 1379-1384 ◽  
Author(s):  
V. I. BOROVKOV ◽  
V. A. BAGRYANSKY ◽  
I. V. YELETSKIKH ◽  
YU. N. MOLIN
Keyword(s):  
Magnetic Field ◽  
Radical Cations ◽  
Magnetic Field Effects ◽  
Time Resolved ◽  
Field Effects

scholarly journals Probing Coherent Vibrations of Organic Phosphonate Radical Cations with Femtosecond Time-Resolved Mass Spectrometry

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 509 ◽  
Author(s):  
Derrick Ampadu Boateng ◽  
Mi’Kayla Word ◽  
Katharine Tibbetts
Keyword(s):  
Mass Spectrometry ◽  
Organophosphorus Compounds ◽  
Vibrational Excitation ◽  
Radical Cations ◽  
Time Resolved ◽  
Oscillatory Dynamics ◽  
Phosphate Backbone ◽  
Molecular Radical ◽  
Ion Yields ◽  
Organic Phosphonate

Organic phosphates and phosphonates are present in a number of cellular components that can be damaged by exposure to ionizing radiation. This work reports femtosecond time-resolved mass spectrometry (FTRMS) studies of three organic phosphonate radical cations that model the DNA sugar-phosphate backbone: dimethyl methylphosphonate (DMMP), diethyl methylphosphonate (DEMP), and diisopropyl methylphosphonate (DIMP). Upon ionization, each molecular radical cation exhibits unique oscillatory dynamics in its ion yields resulting from coherent vibrational excitation. DMMP has particularly well-resolved 45 fs ( 732 ± 28 cm − 1 ) oscillations with a weak feature at 610–650 cm − 1 , while DIMP exhibits bimodal oscillations with a period of ∼55 fs and two frequency features at 554 ± 28 and 670–720 cm − 1 . In contrast, the oscillations in DEMP decay too rapidly for effective resolution. The low- and high-frequency oscillations in DMMP and DIMP are assigned to coherent excitation of the symmetric O–P–O bend and P–C stretch, respectively. The observation of the same ionization-induced coherently excited vibrations in related molecules suggests a possible common excitation pathway in ionized organophosphorus compounds of biological relevance, while the distinct oscillatory dynamics in each molecule points to the potential use of FTRMS to distinguish among fragment ions produced by related molecules.

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