Ultrafast Trap State-Mediated Electron Transfer for Quantum Dot Redox Sensing was written by Harvie, Andrew J.;Smith, Charles T.;Ahumada-Lazo, Ruben;Jeuken, Lars J. C.;Califano, Marco;Bon, Robin S.;Hardman, Samantha J. O.;Binks, David J.;Critchley, Kevin. And the article was included in Journal of Physical Chemistry C in 2018.HPLC of Formula: 605-94-7 This article mentions the following:
Quantum dots (QDs) conjugated to electron acceptor ligands are useful as redox sensors in applications ranging from chem. detection to bioimaging. We aimed to improve effectiveness of these redox-sensing QD conjugates, which depends on the initial charge separation and on the competing mechanisms of recombination, including luminescence and electron transfer to the conjugated redox mols. In this study, ultrafast laser radiation measurements were used to study the excited state dynamics in CdTe/CdS core/shell QDs with quinone/quinol acceptor (Q2NS) ligands attached to the surface (up to 40 per QD). Detailed anal., along with computational simulation, physicochem., physicochem. of the system, showed multiple electron-transfer pathways and identified an ultrafast electron transfer from a surface electron trap state to the quinone ligands (2-8 ps). We propose that this leads to high, redox-dependent, quenching efficiencies (98.7% with an average of 10 quinone/quinols on the surface). As only low populations of redox ligands are required, the colloidal properties of the QD are preserved, which allows for further functionalization. These new insights into the excited state properties and ultrafast charge transfer have important implications for fields exploring charge extraction from quantum dots, which range from bioimaging to solar energy technol. In the experiment, the researchers used many compounds, for example, 2,3-Dimethoxy-5-methylcyclohexa-2,5-diene-1,4-dione (cas: 605-94-7HPLC of Formula: 605-94-7).
2,3-Dimethoxy-5-methylcyclohexa-2,5-diene-1,4-dione (cas: 605-94-7) belongs to ethers. The oxygen atom in ethers are more electronegative than carbon, thus the hydrogens which are alpha to the ethers are more acidic than the simple hydrocarbons. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly autoxidize to form hydroperoxides and dialkyl peroxides. If concentrated or heated, these peroxides may explode. To prevent such explosions, ethers should be obtained in small quantities, kept in tightly sealed containers, and used promptly.HPLC of Formula: 605-94-7
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem