53272-68-7Relevant academic research and scientific papers
Time-Resolved Photodissociation Rates and Kinetic Modeling for Unimolecular Dissociations of Iodotoluene Ions
Lin, Chuan Yuan,Dunbar, Robert C.
, p. 1369 - 1375 (2007/10/02)
Time-resolved photodissociation rate measurements are reported for the unimolecular dissociation of the three iodotoluene ion isomers at two values of internal energy (2.54 and 2.67 eV).For the para isomer, the rate constants are in agreement with previous experimental information.The meta isomer is roughly similar to para, but the ortho isomer dissociates roughly 5 times faster at the same internal energies.These new data, along with prior results, are fitted into a comprehensive two-channel model of the dissociation kinetics, assuming competitive dissociation to form tolyl ions, and either benzyl or tropylium ions.Activation energies and entropies are assigned to both dissociation channels for each isomer.This two-channel model accounts satisfactorily for most of the experimental information available about these dissociation processes, and possible explanations are advanched to explain discrepant data.
STRUCTURE AND REACTIVITY OF C7H7 + IONS FROM THE DECAY OF TRITIATED TOLUENES. 1. REACTIONS OF FREE TOLYL IONS WITH METHANOL IN THE GAS AND LIQUID PHASES.
Cacace,Ciranni,Sparapani,Speranza
, p. 8046 - 8050 (2007/10/02)
Labeled tolyl cations from the decay of ring-multitritiated toluene have been allowed to react with methanol in the liquid and the gas phases, at pressures ranging from 6 to 100 torr, yielding methyl tolyl ethers as the major products, without appreciable
Diazonium salts in photochemistry. I. Quenching of triplet photosensitizers
Scaiano, J. C.,Kim-Thuan, Nguyen
, p. 2286 - 2291 (2007/10/02)
Aromatic diazonium tetrafluoroborates have been shown to be excellent triplet quenchers.Typical rate constants obtained using laser flash photolysis are in the 10*109 M-1 s-1 range in acetonitrile at 300 K.With most senzitizers the interaction leads to the dediazoniation reaction, via either energy transfer or electron transfer mechanisms.In the case of anthracene, where the rate constant for benzenediazonium tetrafluoroborate is (5.4+/-0.3)*109 M-1s-1, the reaction involves the transfer of an electron, leading to the formation of anthracene radical-cation, which has been characterized by absorption spectroscopy.High energy senzitizers such as benzophenone, are believed to lead to aryl cations and nitrogen; the process may involve some degree of charge transfer, since it is somewhat faster when electron donating substituents are present in the diazonium salt.
