64568-30-5Relevant academic research and scientific papers
The Absolute Kinetics of Several Reactions of Substituted Diphenylcarbenes
Hadel, L. M.,Maloney, V. M.,Platz, M. S.,McGimpsey, W. G.,Scaiano, J. C.
, p. 2488 - 2491 (2007/10/02)
4,4'-dibromo-, 4-bromo-, 4,4'-dichloro-, 4-chloro-, 4-methyl-, 4,4'-dimethyl-, 4-phenyl-, 4-carbomethoxyl-, 4-cyano-, 4-cyano-4'-methyl-, and 4,4'-dimethyldiphenyldiazomethane were studied by laser flash photolysis.Excitation of the diazo compounds at 308 nm produced the corresponding diarylcarbenes.The kinetics of the reaction of the substituted carbenes with alkanes and methanol were examined.Hydrogen abstraction rates are largely insensitive to ring substitution, while the methanol reaction is accelerated considerably by p-methyl substitution and retarded by a para electron-withdrawing substituent.
Photophysics of Some Substituted Diphenylmethylenes
Ono, Y.,Ware, W. R.
, p. 4426 - 4433 (2007/10/02)
Absorption, emission, and excitation spectra, fluorescence decay times, and quantum yields of a series of substituted diphenylmethylenes have been measured in various rigid organic matrices at low temperatures.Substitution on the phenyl ring led to a decrease in lifetime, the greatest effect being observed in the dibromo compound, the lifetime of which was 10percent that of the unsubstituted compound.In addition, there was a small but noticeable external heavy atom effect on the decay times.The fluorescence quantum yields of some of the substituted diphenylmethylenes were found to depend on the energy of excitation.Changes in the absorption spectra in the temperature range between 4 and 95 K may be the result of appreciable population of close-lying singlet and triplet levels in the ground state at 95 K.The spectral changes were irreversible, however, possibly implying geometrical configuration changes.
