Detection of singlet oxygen by EPR: The instability of the nitroxyl radicals

Introducing Structural Diversity: Fe2(MoO4)3 Immobilized in Chitosan Films as an Efficient Catalyst for the Selective Oxidation of Sulfides to Sulfones

“…The presence of 1 O 2 was analyzed by EPR using 4-oxo-TMP to capture 1 O 2 (Figure 4D). [46] Unlike the changes caused by the presence of •OH, no significant differences were observed among the blank (H 2 O 2 ), the chitosan film and the Fe100 catalyst. This shows that if 1 O 2 was indeed present, its production was very small.…”

Protein photodegradation in the visible range? Insights into protein photooxidation with respect to protein concentration

“…The principle of the detection of reactive free radical formation (ROS and carbon-centered radicals) using TEMPOL is based on monitoring the decrease in its EPR intensity ( Victória et al, 2022 ) due to the interaction of the nitroxide radical with the generated ROS species and singlet oxygen in the sample ( Victória et al, 2022 ; Matsumoto et al, 2009 ; Davies, 2016 ; Mittag et al, 2022 ). The formed species may be singlet oxygen ( 1 O 2 ), superoxide anion (O 2 − •), hydroxyl radicals (OH•) or different organic radicals (R•).…”

Selective oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran with ZnIn2S4 2D nanosheets and atmospheric O2 under visible light

“…5f) has three lines (1 : 1 : 1 triplet signal) with hyperne arises from the interaction between the unpaired electron, S = 1/2, with the nuclear spin of 14 N, I = 1. 23 In view of all the above analyses, it can be concluded that the selective photooxidation of HMF to DFF in the current system is attained via different reaction pathways, including the contribution of atmospheric O 2 as well as photoinduced charge carriers.…”

“…5f) has three lines (1 : 1 : 1 triplet signal) with hyperfine arises from the interaction between the unpaired electron, S = 1/2, with the nuclear spin of 14 N, I = 1. 23…”