Reaction of imidazoline-2-selone derivatives with mesityltellurenyl iodide: a unique example of a 3c-4e Se→Te←Se three-body system embedding a tellurenyl cation

2019 ◽  
Vol 43 (30) ◽  
pp. 11821-11831 ◽  
Author(s):  
M. Carla Aragoni ◽  
Massimiliano Arca ◽  
Alexander J. Blake ◽  
Enzo Cadoni ◽  
Lucian O. Copolovici ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Body System ◽  
System P ◽  
A Charge ◽  
Three Body

1,2-Bis(3-methyl-4-imidazolin-2-selone)ethane was used to stabilize the first example of an authentic mesityltellurenyl cation, [MesTe]+, as a charge transfer adduct featuring a 3c-4e Se→Te←Se three-body system.

scholarly journals On the approximation of independent pairs in diffusion kinetics: correlation of distances in a three-body system

2018 ◽  
Vol 20 (4) ◽  
pp. 2872-2879
Author(s):  
Eyad H. Al-Samra ◽  
Nicholas J. B. Green
Keyword(s):  
Chemical Kinetics ◽  
Diffusion Kinetics ◽  
Body System ◽  
Radiation Chemical ◽  
System P ◽  
Three Body

This study investigates the problem of diffusion kinetics in a three-body system, motivated by the theory of radiation chemical kinetics.

scholarly journals NIR-to-visible upconversion in quantum dots via a ligand induced charge transfer state

RSC Advances ◽  
2019 ◽  
Vol 9 (21) ◽  
pp. 12153-12161 ◽  
Author(s):  
Noga Meir ◽  
Iddo Pinkas ◽  
Dan Oron
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Charge Transfer State ◽  
Charge Transfer Transition ◽  
System P ◽  
Induced Charge ◽  
A Charge ◽  
Transfer State

Photon upconversion is facilitated by the generation of a charge transfer transition in the interface of a coupled QD–thiol system.

Time-resolved photoelectron spectroscopy of IR-driven electron dynamics in a charge transfer model system

2017 ◽  
Vol 19 (30) ◽  
pp. 19683-19690 ◽  
Author(s):  
Mirjam Falge ◽  
Friedrich Georg Fröbel ◽  
Volker Engel ◽  
Stefanie Gräfe
Keyword(s):  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Model System ◽  
Photoelectron Spectra ◽  
Transfer Model ◽  
Electron Dynamics ◽  
Time Resolved ◽  
System P ◽  
A Charge ◽  
Charge Transfer Model

IR and XUV pulse interaction result in modulated asymmetries of photoelectron spectra.

Determination of Epsilon Aminocaproic Acid Based on Charge Transfer Complexation with p-Nitrophenlol by Spectrophotometry

2020 ◽  
Vol 16 ◽  
Author(s):  
Sheng-Yun Li ◽  
Fang Tian
Keyword(s):  
Charge Transfer ◽  
Aminocaproic Acid ◽  
Concentration Limit ◽  
Official Method ◽  
Good Precision ◽  
Pharmaceutical Dosage Forms ◽  
Relative Standard ◽  
A Charge ◽  
Epsilon Aminocaproic Acid

: A spectrophotometry was investigated for the determination of epsilon aminocaproic acid (EACA) with p-nitrophenol (PNP). The method was based on a charge transfer (CT) complexation of this drug as n-electron donor with π-acceptor PNP. Experiment indicated that the CT complexation was carried out at room temperature for 10 minutes in dimethyl sulfoxide solvent. The spectrum obtained for EACA/PNP system showed the maximum absorption band at wavelength of 425 nm. The stoichiometry of the CT complex was found to be 1:1 ratio by Job’s method between the donor and the acceptor. Different variables affecting the complexation were carefully studied and optimized. At the optimum reaction conditions, Beer’s law was obeyed in a concentration limit of 1～6 µg mL-1. The relative standard deviation was less than 2.9%. The apparent molar absoptivity was determined to be 1.86×104 L mol-1cm-1 at 425 nm. The CT complexation was also confirmed by both FTIR and 1H NMR measurements. The thermodynamic properties and reaction mechanism of the CT complexation have been discussed. The developed method could be applied successfully for the determination of the studied compound in its pharmaceutical dosage forms with a good precision and accuracy compared to official method as revealed by t- and F-tests.

Fluorescence Quenching of Aminodiphenylamines with Chloromethanes

2002 ◽  
Vol 67 (8) ◽  
pp. 1154-1164 ◽  
Author(s):  
Nachiappan Radha ◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Ground State ◽  
Rate Constants ◽  
Quenching Mechanism ◽  
Quenching Rate ◽  
Charge Transfer Interaction ◽  
Electronically Excited ◽  
A Charge

The fluorescence quenching of 2-aminodiphenylamine (2ADPA), 4-aminodiphenylamine (4ADPA) and 4,4'-diaminodiphenylamine (DADPA) with tetrachloromethane, chloroform and dichloromethane have been studied in hexane, dioxane, acetonitrile and methanol as solvents. The quenching rate constants for the process have also been obtained by measuring the lifetimes of the fluorophores. The quenching was found to be dynamic in all cases. For 2ADPA and 4ADPA, the quenching rate constants of CCl4 and CHCl3 depend on the viscosity, whereas in the case of CH2Cl2, kq depends on polarity. The quenching rate constants for DADPA with CCl4 are viscosity-dependent but the quenching with CHCl3 and CH2Cl2 depends on the polarity of the solvents. From the results, the quenching mechanism is explained by the formation of a non-emissive complex involving a charge-transfer interaction between the electronically excited fluorophores and ground-state chloromethanes.

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