Observation of Oscillatory Surface Reactions of Riboflavin, Trolox, and Singlet Oxygen Using Single Carbon Nanotube Fluorescence Spectroscopy

ACS Nano ◽  
2012 ◽  
Vol 6 (12) ◽  
pp. 10632-10645 ◽  
Author(s):  
Fatih Sen ◽  
Ardemis A. Boghossian ◽  
Selda Sen ◽  
Zachary W. Ulissi ◽  
Jingqing Zhang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Fluorescence Spectroscopy ◽  
Singlet Oxygen ◽  
Surface Reactions

Development of pyrene-stacked carbon nanotube-based hybrid: measurement of NO3− ions using fluorescence spectroscopy

The Analyst ◽  
2018 ◽  
Vol 143 (14) ◽  
pp. 3343-3352 ◽  
Author(s):  
Beant Kaur Billing ◽  
Mayank Mayank ◽  
Prabhat K. Agnihotri ◽  
Narinder Singh
Keyword(s):  
Carbon Nanotube ◽  
Fluorescence Spectroscopy ◽  
Nitrate Ions ◽  
Fluorescent Recognition

CNT@pyrene hybrid for fluorescent recognition of nitrate ions.

Equilibrium concentration of singlet oxygen in photoreaction of reaction center/carbon nanotube bionanocomposites

2015 ◽  
Vol 252 (11) ◽  
pp. 2479-2484 ◽  
Author(s):  
Anikó Kinka ◽  
Kata Hajdu ◽  
Melinda Magyar ◽  
László Mucsi ◽  
Tibor Szabó ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Singlet Oxygen ◽  
Reaction Center ◽  
Equilibrium Concentration

scholarly journals DNA-Directed Assembly of Carbon Nanotube–Protein Hybrids

Biomolecules ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 955
Author(s):  
Mark Freeley ◽  
Rebecca E. A. Gwyther ◽  
D. Dafydd Jones ◽  
Matteo Palma
Keyword(s):  
Atomic Force Microscopy ◽  
Carbon Nanotube ◽  
Fluorescence Spectroscopy ◽  
Emission Intensity ◽  
Directed Assembly ◽  
Electronic Coupling ◽  
Force Microscopy ◽  
Controlled Assembly ◽  
Atomic Force ◽  
Microscopy Images

Here, we report the controlled assembly of SWCNT–GFP hybrids employing DNA as a linker. Two distinct, enriched SWCNTs chiralities, (6,5), (7,6), and an unsorted SWCNT solution, were selectively functionalized with DNA and hybridized to a complementary GFPDNA conjugate. Atomic force microscopy images confirmed that GFP attachment occurred predominantly at the terminal ends of the nanotubes, as designed. The electronic coupling of the proteins to the nanotubes was confirmed via in-solution fluorescence spectroscopy, that revealed an increase in the emission intensity of GFP when linked to the CNTs.

scholarly journals New Acridone- and (Thio)Xanthone-Derived 1,1-Donor–Acceptor-Substituted Alkenes: pH-Dependent Fluorescence and Unusual Photooxygenation Properties

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3305
Author(s):  
Tim Lippold ◽  
Jörg M. Neudörfl ◽  
Axel Griesbeck
Keyword(s):  
Fluorescence Spectroscopy ◽  
Singlet Oxygen ◽  
Photophysical Properties ◽  
Stokes Shift ◽  
Synthetic Route ◽  
Reactivity Pattern ◽  
Absorption And Fluorescence Spectroscopy ◽  
Donor Acceptor ◽  
Ph Dependent ◽  
Presence And Absence

A synthetic route to new heterocyclic 1,1-donor–acceptor-substituted alkenes starting with N-methyl-acridone, xanthone, and thioxanthone was investigated, leading to the acridone- and xanthone-derived products methyl 2-methoxy-2-(10-methylacridin-9 (10H)-ylidene)acetate (7) and methyl 2-methoxy-2-(9H-xanthen-9-ylidene)acetate (10) in low yields with the de-methoxylated product methyl 2-(10-methylacridin-9 (10H)-ylidene)acetate (8) and the reduced compound methyl 2-methoxy-2-(9H-xanthen-9-yl)acetate (11) as the major products from N-methyl acridone and xanthone. From thioxanthone, only the rearrangement and reduction products (14) and (15) resulted. The photophysical properties of compounds (7), (8), and (10) were investigated in the presence and absence of the Brønsted acid TFA by NMR, UV–VIS absorption, and fluorescence spectroscopy. Protonation of the acridone-derived alkenes (7) and (8) led to strong bathochromic and hyperchromic fluorescence shifts and a substantial increase in Stokes shift. The photooxygenation experiments with these substrates showed an unusual reactivity pattern in the singlet oxygen processes: whereas the electron-rich enolether (7) was chemically unreactive, (8) and (10) were oxidatively cleaved, presumably via intermediate 1,2-dioxetanes.

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