Journal of the Chemical Society. Perkin transactions II p. 99 - 104 (1993)
Update date:2022-08-31
Topics:
Balon, Manuel
Hidalgo, Jose
Guardado, Pilar
Munoz, Maria A.
Carmona, Carmen
The absorption and fluorescence spectra of a set of dehydro and fully aromatic β-carboline (9H-pyrido<3,4-b>indole) derivatives have been investigated in aqueous solutions of varying acidity.Within the pH-range, cationic (nitrogen protonation) and neutral species are evidenced from both absorption and fluorescence spectra.Additional zwitterionic species can also be detected from the fluorescence spectra.In highly basic media, outside the pH-range, anionic species (pyrrolic nitrogen deprotonation) are formed.Ground state ionization constants for the differentacid-base equilibria involving these species have been determined spectrophotometrically at 25 deg C.Lowest excited singlet state pKas have been estimated from the Foerster-Weller cycle.The influence of structural variations on the spectra and on the acid-base properties of these compounds is discussed.
View MoreTianjin Boron PharmaTech Co.,Ltd.(expird)
Contact:86-022-59845187
Address:B9-401, Tianda Science Park,No.80,4th Avenue,TEDA,Tianjin, China
Luoyang Aoda chemical Co.,Ltd.
Contact:+86-379-67518785 67516588
Address:MiaoWan industry district,YanShi City,Henan,China
Shaanxi Lighte Optoelectronics Material Co., Ltd.
Contact:+86-29-88320728-622/619/620
Address:No.55 INDUSTRY ROAD 2,XI'AN NATIONAL CIVIL AEROSPACE INDUSTRIAL PARK.XI'AN China 710065.
website:http://www.chinacharm.cn/
Contact:86 551 5316260
Address:No. 211,XiangZhang Road,Hefei City,Anhui Province,China
Contact:+86-0311-84455288-844
Address:Mayu Industrial Park, Jinzhou, Hebei, China.
Doi:10.1055/s-0039-1690266
(2020)Doi:10.1039/jr9640005640
(1964)Doi:10.1016/j.ica.2021.120335
(2021)Doi:10.1021/jo00394a048
(1979)Doi:10.1021/jo020033s
(2002)Doi:10.1016/j.tetlet.2014.11.108
(2015)
