Radical cations of twisted acenes: chiroptical properties and spin delocalization

2019 ◽  
Vol 55 (43) ◽  
pp. 6022-6025 ◽  
Author(s):  
Anjan Bedi ◽  
Raanan Carmieli ◽  
Ori Gidron
Keyword(s):  
Radical Cations ◽  
Chiroptical Properties ◽  
Spin Delocalization ◽  
Epr Signal

A series of enantiopure twistacene radical cations display dependency of the chiroptical properties and the EPR signal on the backbone twist.

scholarly journals Spin Delocalization in the Radical Cations of Porphyrin Molecular Wires: A New Perspective on EPR Approaches

2019 ◽  
Vol 10 (19) ◽  
pp. 5708-5712
Author(s):  
Gabriel Moise ◽  
Lara Tejerina ◽  
Michel Rickhaus ◽  
Harry L. Anderson ◽  
Christiane R. Timmel
Keyword(s):  
Radical Cations ◽  
Molecular Wires ◽  
Spin Delocalization ◽  
New Perspective

Reactivity Trends in the Gas Phase Addition of Acetylene to N-protonated Aryl Radical Cations

2020 ◽  
Author(s):  
Oisin Shiels ◽  
P. D. Kelly ◽  
Cameron C. Bright ◽  
Berwyck L. J. Poad ◽  
Stephen Blanksby ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ion Trap ◽  
Radical Cations ◽  
Rate Coefficients ◽  
Similar Process ◽  
Ion Molecule Reactions ◽  
Aromatic Radicals ◽  
Polycyclic Aromatic ◽  
Gas Phase Ion ◽  
Type Radical

<div> <div> <div> <p>A key step in gas-phase polycyclic aromatic hydrocarbon (PAH) formation involves the addition of acetylene (or other alkyne) to σ-type aromatic radicals, with successive additions yielding more complex PAHs. A similar process can happen for N- containing aromatics. In cold diffuse environments, such as the interstellar medium, rates of radical addition may be enhanced when the σ-type radical is charged. This paper investigates the gas-phase ion-molecule reactions of acetylene with nine aromatic distonic σ-type radical cations derived from pyridinium (Pyr), anilinium (Anl) and benzonitrilium (Bzn) ions. Three isomers are studied in each case (radical sites at the ortho, meta and para positions). Using a room temperature ion trap, second-order rate coefficients, product branching ratios and reaction efficiencies are reported. </p> </div> </div> </div>

Chiroptical properties of derivatives of L-altruronic acid

1978 ◽  
Vol 43 (8) ◽  
pp. 2062-2067
Author(s):  
Slavomír Bystrický ◽  
Tibor Sticzay ◽  
Pavol Kováč
Keyword(s):  
Chiroptical Properties ◽  
Derivatives Of

Chiroptical properties of morphinan derivatives

1975 ◽  
Vol 40 (3) ◽  
pp. 670-680 ◽  
Author(s):  
R. Bognár ◽  
Gy. Gaál ◽  
P. Kerekes ◽  
A. Lévai ◽  
S. Makleit ◽  
...  
Keyword(s):  
Chiroptical Properties

Photochemical decomposition of t-butyl hydroperoxide; Photocatalytical effects of VO(II) and Co(III) 2,4-pentanedionates

1988 ◽  
Vol 53 (3) ◽  
pp. 497-505 ◽  
Author(s):  
Stanislav Luňák ◽  
Aleksandr I. Kokorin ◽  
Eva Mácová ◽  
Pavel Lederer
Keyword(s):  
Free Radical ◽  
Opposite Effect ◽  
Radical Intermediate ◽  
Butyl Hydroperoxide ◽  
Free Radical Intermediate ◽  
Catalytically Active ◽  
Photochemical Decomposition ◽  
Epr Signal

It has been found that [VO(acac)2] and [Co(acac)3] increase the rate of t-BuOOH photolysis, whereas [Fe(acac)3] has the opposite effect. Redox changes of the catalytically active [VO(acac)2] were followed using the EPR technique. An EPR signal from a free radical intermediate of photochemical decomposition of t-BuOOH was recorded, and the concentration of the intermediate was monitored during the reaction.

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