| LERESCHE, Frank, Lucie LUDVÍKOVÁ, Dominik HEGER, Petr KLÁN, Urs VON GUNTEN and Silvio CANONICA. Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN). PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES. Cambridge: ROYAL SOC CHEMISTRY, 2019, vol. 18, No 2, p. 534-545. ISSN 1474-905X. Available from: https://dx.doi.org/10.1039/c8pp00519b. |
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@article{1511177,
author = {Leresche, Frank and Ludvíková, Lucie and Heger, Dominik and Klán, Petr and von Gunten, Urs and Canonica, Silvio},
article_location = {Cambridge},
article_number = {2},
doi = {http://dx.doi.org/10.1039/c8pp00519b},
keywords = {laser flash photolysis},
language = {eng},
issn = {1474-905X},
journal = {PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES},
title = {Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN)},
url = {https://pubs.rsc.org/en/content/articlelanding/2019/PP/C8PP00519B#!divAbstract},
volume = {18},
year = {2019}
}
TY - JOUR
ID - 1511177
AU - Leresche, Frank - Ludvíková, Lucie - Heger, Dominik - Klán, Petr - von Gunten, Urs - Canonica, Silvio
PY - 2019
TI - Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN)
JF - PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
VL - 18
IS - 2
SP - 534-545
EP - 534-545
PB - ROYAL SOC CHEMISTRY
SN - 1474905X
KW - laser flash photolysis
UR - https://pubs.rsc.org/en/content/articlelanding/2019/PP/C8PP00519B#!divAbstract
L2 - https://pubs.rsc.org/en/content/articlelanding/2019/PP/C8PP00519B#!divAbstract
N2 - Aromatic amines are aquatic contaminants for which phototransformation in surface waters can be induced by excited triplet states of dissolved organic matter ((DOM)-D-3*). The first reaction step is assumed to consist of a one-electron oxidation process of the amine to produce its radical cation. In this paper, we present laser flash photolysis investigations aimed at characterizing the photoinduced, aqueous phase one-electron oxidation of 4-(dimethylamino) benzonitrile (DMABN) as a representative of this contaminant class. The production of the radical cation of DMABN (DMABN(center dot+)) after direct photoexcitation of DMABN at 266 nm was confirmed in accord with previous experimental results. Moreover, DMABN(center dot+) was shown to be produced from the reactions of several excited triplet photosensitizers (carbonyl compounds) with DMABN. Second-order rate constants for the quenching of the excited triplet states by DMABN were determined to fall in the range of 3 x 10(7)-5 x 10(9) M-1 s(-1), and their variation was interpreted in terms of electron transfer theory using a Rehm-Weller relationship. The decay kinetics of DMABN(-+) in the presence of oxygen was dominated by a second-order component attributed to its reaction with the superoxide radical anion (O-2(center dot-)). The first-order rate constant for the transformation of DMABN(center dot+) leading to photodegradation of DMABN was estimated not to exceed approximate to 5 x 10(3) s(-1).
ER -
LERESCHE, Frank, Lucie LUDVÍKOVÁ, Dominik HEGER, Petr KLÁN, Urs VON GUNTEN and Silvio CANONICA. Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN). \textit{PHOTOCHEMICAL \&{} PHOTOBIOLOGICAL SCIENCES}. Cambridge: ROYAL SOC CHEMISTRY, 2019, vol.~18, No~2, p.~534-545. ISSN~1474-905X. Available from: https://dx.doi.org/10.1039/c8pp00519b.
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