124605-72-7Relevant articles and documents
Picosecond kinetic study of the dynamics for photoinduced homolysis and heterolysis in diphenylmethyl chloride
Lipson, Matthew,Deniz, Ashok A.,Peters, Kevin S.
, p. 3580 - 3586 (1996)
The kinetics of both the ions and radicals formed upon photolysis of diphenylmethyl chloride, (4-methoxyphenyl)phenylmethyl chloride, and bis(4-methoxyphenyl)methyl chloride in acetonitrile and propionitrile are examined by picosecond pump - probe spectroscopy. Both radical pairs and ion pairs are formed directly from a common excited state. In addition, the geminate radical pair decays by electron transfer to form either the contact ion pair or a covalent bond, as well as undergoes diffusional separation to free radicals.
Three-color three-laser photochemistry of di(p-methoxyphenyl)methyl chloride
Hara, Michihiro,Tojo, Sachiko,Majima, Tetsuro
, p. 4778 - 4783 (2003)
Three-color three-laser photochemistry of di(p-methoxyphenyl)methyl chloride ((p-CH3OC6H4)2CHCl = An2CHCl) was studied by three-step excitation using 308-, 355-, and 495-nm lasers with delay times of 100 ns to 3 μs. Di(p-methoxyphenyl)methyl radical (An2CH) was produced together with An2CH in the excited state (An2CH*) and di(p-methoxyphenyl)methyl cation (An2CH+) in quantum yields of 0.09, 0.12, and 0.12, respectively, after a laser flash during 308-nm laser (first laser) photolysis of An2CHCl in acetonitrile. Excitation of An2CH with a 355-nm laser (second laser) resulted in formation of transient absorption of An2CH* and An2CH+ and fluorescence of An2CH* with a peak at 550 nm. The formation of An2CH+ from An2CH requires two-photon energy at 355 nm and proceeds by resonant two-photon ionization (RETPI) of An2CH through sequential excitation of An2CH*. Excitation of An2CH+ with a 495-nm laser (third laser) produced fluorescence with a peak at 560 nm. Although the fluorescence of An2CH+ was also observed without the second laser excitation because of the initial formation of An2CH+ during the first 308-nm laser photolysis, the fluorescence intensity of An2CH+ increased approximately 1.2 times with the second 355-nm laser excitation of An2CH. Therefore, the second laser excitation can perform the conversion of An2CH to An2CH+ through RETPI within the laser flash duration, and the fluorescence intensity of An2CH+ can be controlled by the second irradiation.
Protonation of Diarylcarbenes by Alcohols: The Importance of Ion Pair Dynamics
Dix, Edward J.,Goodman, Joshua L.
, p. 12609 - 12612 (2007/10/02)
Picosecond laser excitation of either di(p-chlorophenyl)- or di(p-methoxyphenyl)diazomethane generates a transient which we ascribe to the singlet states of di(p-chlorophenyl)- and di(p-methoxyphenyl)carbenes, 1a and 1b, respectively.Picosecond absorption spectroscopy is used to determine their kinetic behavior in various solvents.In the presence of alcohols, these carbenes are protonated, forming contact-ion pairs.These ion pairs partition between collapse to ether products and separation to free carbenium ions, 2a and 2b, which are readily observed.The dynamics of these ion pairs is discussed.Protonation of carbenes can provide an alternative method for the preparation of ion pairs and the investigation of their dynamics.
