L. Prasad, R. Ding, Hanqing Wang
Oct 21, 1988
Citations
0
Influential Citations
4
Citations
Journal
Chemical Physics Letters
Abstract
Abstract According to EPR and INDO studies, monomeric radical cations of 2,5-dimethyl-2,4-hexadiene (DMHD) and 2,7-dimethyl 2,4,6-octatriene (DMOT) are formed in X-ray irradiated CCl 4 or CCIF 3 frozen solutions containing 1 mol% polyene, while dimeric radical cations are formed in 5–10% CCl 4 solutions of polyene reacted with AlCl 3 . The monomeric DMHD radical cation gives rise to EPR hyperfine coupling constants a 1 (6H) = 13.1, a 2 (6H)= 10.9, and a 3 (2H) = 3.0 G while the EPR couplings for the monomeric DMOT radical cation are a 1 (6H)= 9.5, a 2 (6H) = 8.3 and a 3 (2H) = 1.2 G. The resolved EPR spectrum of the DMHD dimer cation consists of two groups of twelve and one group of four equivalent protons with coupling constants equal to 6.0, 5.6 and 1.5 G respectively. The DMOT dimer radical cation EPR spectrum consists of a single unresolved line with a linewidth of 24 G.