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
Impakt faktor
Impact factor: 2.831
Kód RIV
RIV/00216224:14310/19:00109353
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000458569100026
EID Scopus
2-s2.0-85061394130
Klíčová slova česky
laser flash photolysis
Klíčová slova anglicky
laser flash photolysis
Štítky
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 |
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LO1214, projekt VaV |
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