38406-85-8Relevant academic research and scientific papers
Electron Transfer from Aromatic Compounds to Phenyliodinium and Diphenylsulfinium Radical Cations
Yagci, Y.,Schnabel, W.,Wilpert, A.,Bending, J.
, p. 287 - 292 (1994)
Phenyliodinium (I.(+1)) and diphenylsulfinium radical cations (II.(+1)) have been generated by flash photolysis (λinc = 347 nm) of diphenyliodonium ions (I(+1)) and diphenyl(4-phenylthiophenyl)sulfonium ions (II(+1)) in acetonitrile solutions at room temperature.I.(+1) and II.(+1) were found to undergo electron-transfer reactions with benzene derivatives resulting in the formation of radical cations of the aromatic compounds.A study involving 25 compounds including various methyl- and methoxy-benzenes, biphenyl, phenol and cresols revealed that electron transfer is independent of the ionizations energy Ei provided that the rates are encounter-controlled.This applies to cases where Ei does not exceed a critical value: Ei,crit ca. 820 kJ mol-1 (I.(+1)) and 780 kJ mol-1 (II.(+1)).Bimolecular rate constants decrease with increasing Ei in the case of aromatic compounds having ionization energies exceeding the critical values.A Marcus-inverted region was not detected.
Vibrational Spectroscopy and Photodissociation Properties of Ions As Determined by Two-Laser Photodissociation Techniques.
Honovich, Jeffrey P.,Dunbar, Robert C.
, p. 3755 - 3758 (2007/10/02)
Iodobenzene, bromobenzene, and m-iodotoluene cations trapped in an ion cyclotron resonance (ICR) mass spectrometer undergo an enhanced visible photodissociation process in the presence of infrared irradiation.The infrared wavelength dependence in the 9.7-10.7-μm region for this effect exhibits features wich relate to the infrared spectroscopy of these ions.The variation in extent of the infrared enhancement with visible wavelength is interpreted as reflecting two different mechanisms: at short wavelengths the enhancement is attributed to changes invisible-absorption cross section with increasing internal energy and gives a useful means of observing such effects, while at long wavelengths the enhancement is attributed to a perturbation of the two-photon dissociation kinetics.The photodissociation rates of several other ions were shown not to undergo an enhancement effect when irradiated with the infrared laser.
