TY  - JOUR
A1  - Primus, Philipp-A.
A1  - Kumke, Michael Uwe
T1  - Flash photolysis study of complexes between salicylic acid and lanthanide ions in water
T2  - The journal of physical chemistry : A, Molecules, spectroscopy, kinetics, environment & general theory
N2  - In the natural environment humic substances (HS) represent a major factor determining the speciation of metal ions, e.g., in the context of radionuclide migration. Here, due to their intrinsic sensitivity and selectivity, spectroscopic methods are often applied, requiring a fundamental understanding of the photophysical processes present in such HS-metal complexes. Complexes with different metal ions were studied using 2-hydroxybenzoic acid (2HB) as a model compound representing an important part of the chelating substructures in HS. In flash photolysis experiments under direct excitation of 2HB in the absence and the presence of different lanthanide ions, the generation and the decay of the 2HB triplet state, of the phenoxy radical, and of the solvated electron were monitored. Depending on the lanthanide ion different intracomplex processes were observed for these transient species including energy migration to and photoreduction of the lanthanide ion. The complexity of the intracomplex photophysical processes even for small molecules such as 2HB underlines the necessity to step-by-step approach the photochemical reactivity of HS by using suitable model compounds.
Y1  - 2012
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36136
SN  - 1089-5639
VL  - 116
IS  - 4
SP  - 1176
EP  - 1182
PB  - American Chemical Society
CY  - Washington
ER  -