Journal of Physical Organic Chemistry p. 152 - 158 (1997)
Update date:2022-08-16
Topics:
Wu, Long-Min
Lue, Jian-Ming
Wen, Xiao-Lin
Jia, Xue-Qing
Liu, You-Cheng
Liu, Zhong-Li
An appreciable equilibrium isotope effect has been observed for electron transfer from phenothiazine (PT) to the radical cation of its 15N-substituted analogue ([15N]PT+?), i.e. equation presented via electron paramagnetic resonance analysis of the mixed radical cations formed from mixing the [15N]phenothiazine radical cation hexachloroantimonate and phenothiazine in acetonitrile (K=0·77±0·10 at 25 °C), and by physical separation of the neutral phenothiazines from the radical cation salts in the equilibrium mixture (K=0·83±0·10 at 25 °C). Infrared and Raman spectra of [14N]- and [15N]phenothiazines and their radical cations were measured to assign the vibrational frequency shifts caused by the heavy-atom substitution and radical cation formation, which gave an estimate of the enthalpy change of 441·7 J mol-1 for the electron transfer process. These results reveal that 15N substitution of phenothiazine decreases appreciably the ionization potential of the molecule, making it easier to lose an electron to form the corresponding radical cation in solution.
View MoreChangzhou Welton Chemical Co., Ltd,
Contact:0086-519-85910828,85920537,85912897
Address:No.8 Jinlong Road, Binjiang Park, Changzhou, Jiangsu, China.
Springchem New Material Technology Co.,Limited
website:http://www.spring-chem.com
Contact:86-21-62885108
Address:602B, Building 1, No. 641, Tianshan Road
Contact:+86-10-83993285
Address:Rm.1708, Haobai Tower, Building 6, No.50, North Road, West Third Ring, Haidian District, Beijing, China
Suzhou CarbonWell Pharma-Tech Co., Ltd
Contact:Tel: + 86 (0)512-8898-1216; + 86-18606258602
Address:2358 Changan Road, Wujiang Scientific Innovation Park, Wujiang, Jiangsu Province, P. R. China 215200
Hebei Kangtai Pharmaceutical Co.,Ltd
Contact:+86-0317-3512963
Address:Wugang Road,Mengcun of Cangzhou City,Hebei Province ,China
Doi:10.1021/jf980506p
(1998)Doi:10.1021/jo01219a010
(1938)Doi:10.1016/S0040-4039(01)88645-7
(1969)Doi:10.1021/cg200681s
(2012)Doi:10.1016/j.tetlet.2009.11.030
(2010)Doi:10.1016/j.bmcl.2006.01.002
(2006)