Photodecarboxylation of citrate through ion pair photochemistry: the Co(Sep)3+·citraten- (n = 1,2,3) system

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Abstract

The Co(Sep)3+ complex (Sep = sepulchrate = 1,3,6,8,10,13,16,19-octaazabicyclo[6.6.6]eicosane) forms ion pairs with citrate in aqueous solution at pH 4.0, 5.6 and 8.5, where the forms CIT-, CIT2- and CIT3- (CIT = citrate) predominate respectively. Irradiation in the ion pair charge transfer band for the three pH values leads to the decarboxylation of citrate with the production of CO2 and Co(Sep)2+. In the presence of colloidal platinum, CO2 and H2 are evolved. The quantum yields for formation of CO2, Co(Sep)2+ and H2 were obtained and are discussed in terms of their dependence on pH.

Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume49
Issue number1-2
DOIs
Publication statusPublished - 1 Jan 1989

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