Laser flash photolysis study of the photoinduced oxidation of
4-(dimethylamino)benzonitrile (DMABN)

J 2019

Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN)

LERESCHE, Frank, Lucie LUDVÍKOVÁ, Dominik HEGER, Petr KLÁN, Urs VON GUNTEN et. al.

Základní údaje

Originální název

Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN)

Autoři

LERESCHE, Frank (756 Švýcarsko), Lucie LUDVÍKOVÁ (203 Česká republika, domácí), Dominik HEGER (203 Česká republika, domácí), Petr KLÁN (203 Česká republika, garant, domácí), Urs VON GUNTEN (756 Švýcarsko) a Silvio CANONICA (756 Švýcarsko)

Vydání

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, Cambridge, ROYAL SOC CHEMISTRY, 2019, 1474-905X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10403 Physical chemistry

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Full Text

Impakt faktor

Impact factor: 2.831

Kód RIV

RIV/00216224:14310/19:00109353

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1039/c8pp00519b

UT WoS

000458569100026

Klíčová slova česky

laser flash photolysis

Klíčová slova anglicky

laser flash photolysis

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 17. 2. 2023 20:59, Mgr. Michaela Hylsová, Ph.D.

Anotace

V originále

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).

Návaznosti

LM2011028, projekt VaV

Název: RECETOX ? Národní infrastruktura pro výzkum toxických látek v prostředí

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, RECETOX Národní infrastruktura pro výzkum toxických látek v prostředí

LO1214, projekt VaV

Název: Centrum pro výzkum toxických látek v prostředí (Akronym: RECETOX)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Centrum pro výzkum toxických látek v prostředí

Citovat

LERESCHE, Frank, Lucie LUDVÍKOVÁ, Dominik HEGER, Petr KLÁN, Urs VON GUNTEN a Silvio CANONICA. Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN). PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES. Cambridge: ROYAL SOC CHEMISTRY, 2019, roč. 18, č. 2, s. 534-545. ISSN 1474-905X. Dostupné z: https://dx.doi.org/10.1039/c8pp00519b.

@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 a Silvio CANONICA. Laser flash photolysis study of the photoinduced oxidation of 4-(dimethylamino)benzonitrile (DMABN). \textit{PHOTOCHEMICAL \&{} PHOTOBIOLOGICAL SCIENCES}. Cambridge: ROYAL SOC CHEMISTRY, 2019, roč.~18, č.~2, s.~534-545. ISSN~1474-905X. Dostupné z: https://dx.doi.org/10.1039/c8pp00519b.

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