TY - JOUR
T1 - Photodecarboxylation of citrate through ion pair photochemistry: the Co(Sep)3+·citraten- (n = 1,2,3) system
AU - Sotomayor, João
AU - Costa, Júlia C.
AU - Mulazzani, Quinto G.
AU - Pina, Fernando
PY - 1989/1/1
Y1 - 1989/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0008136465&partnerID=8YFLogxK
U2 - 10.1016/1010-6030(89)87118-7
DO - 10.1016/1010-6030(89)87118-7
M3 - Article
AN - SCOPUS:0008136465
VL - 49
SP - 195
EP - 202
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
IS - 1-2
ER -