Chemiluminescence studies. V. Production of electronically excited alkali atoms in reactions of Li, Na, and Cs with NF3 and of Cs with F2

1976 ◽  
Vol 64 (5) ◽  
pp. 2247-2252 ◽  
Author(s):  
M. Luria ◽  
D. J. Eckstrom ◽  
S. A. Edelstein ◽  
B. E. Perry ◽  
S. W. Benson
Keyword(s):  
Alkali Atoms ◽  
Electronically Excited

Dynamics of electronically excited alkali atoms in superfluid helium

1996 ◽  
Vol 46 (S1) ◽  
pp. 359-360 ◽  
Author(s):  
Toshiya Kinoshita ◽  
Koichi Fukuda ◽  
Toru Matsuura ◽  
Tsutomu Yabuzaki
Keyword(s):  
Superfluid Helium ◽  
Alkali Atoms ◽  
Electronically Excited

scholarly journals Reaction Dynamics of Electronically Excited Alkali Atoms with Simple Molecules

1985 ◽  
Vol 32 (3) ◽  
pp. 179-185 ◽  
Author(s):  
Paul S. Weiss ◽  
Jean-Michel Mestdagh ◽  
Hartmut Schmidt ◽  
Matthew F. Vernon ◽  
Michael H. Covinsky ◽  
...  
Keyword(s):  
Reaction Dynamics ◽  
Alkali Atoms ◽  
Electronically Excited ◽  
Simple Molecules

Carbon-Heteroatom Cross-Coupling via an Electronically Excited Nickel (II) Complex

2019 ◽  
Author(s):  
Randolph Escobar ◽  
Jeffrey Johannes
Keyword(s):  
Energy Transfer ◽  
Functional Groups ◽  
Cross Coupling ◽  
Reductive Elimination ◽  
Aryl Halides ◽  
Coupling Reactions ◽  
General Methodology ◽  
Cross Coupling Reactions ◽  
Electronically Excited ◽  
Energy Transfer Pathway

<div>While carbon-heteroatom cross coupling reactions have been extensively studied, many methods are specific and</div><div>limited to a set of substrates or functional groups. Reported here is a method that allows for C-O, C-N and C-S cross coupling reactions under one general methodology. We propose that an energy transfer pathway, in which an iridium photosensitizer produces an excited nickel (II) complex, is responsible for the key reductive elimination step that couples aryl halides to 1° and 2° alcohols, anilines, thiophenols, carbamates and sulfonamides.</div>

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.

Sign in / Sign up

Export Citation Format

Share Document