Electron transfer competes with proton transfer in gas-phase acid-base reactions

1988 ◽  
Vol 110 (12) ◽  
pp. 4048-4049 ◽  
Author(s):  
Chau Chung. Han ◽  
John I. Brauman
Keyword(s):  
Electron Transfer ◽  
Proton Transfer ◽  
Gas Phase ◽  
Acid Base

scholarly journals Electron Transfer versus Proton Transfer in Gas-Phase Ion/Ion Reactions of Polyprotonated Peptides

2005 ◽  
Vol 127 (36) ◽  
pp. 12627-12639 ◽  
Author(s):  
Harsha P. Gunawardena ◽  
Min He ◽  
Paul A. Chrisman ◽  
Sharon J. Pitteri ◽  
Jason M. Hogan ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Proton Transfer ◽  
Gas Phase ◽  
Gas Phase Ion

scholarly journals Excited state intramolecular proton transfer in hydroxyanthraquinones: Toward predicting fading of organic red colorants in art

2019 ◽  
Vol 5 (9) ◽  
pp. eaaw5227 ◽  
Author(s):  
J.A. Berenbeim ◽  
S. Boldissar ◽  
S. Owens ◽  
M.R. Haggmark ◽  
G. Gate ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Proton Transfer ◽  
Gas Phase ◽  
Intramolecular Proton Transfer ◽  
Structural Trend ◽  
Works Of Art ◽  
Proton Transfers ◽  
Proposed Model ◽  
High Level

Compositionally similar organic red colorants in the anthraquinone family, whose photodegradation can cause irreversible color and stability changes, have long been used in works of art. Different organic reds, and their multiple chromophores, suffer degradation disparately. Understanding the details of these molecules’ degradation therefore provides a window into their behavior in works of art and may assist the development of improved conservation methods. According to one proposed model of photodegradation dynamics, intramolecular proton transfer provides a kinetically favored decay pathway in some photoexcited chromophores, preventing degradation-promoting electron transfer (ET). To further test this model, we measured excited state lifetimes of substituted gas-phase anthraquinones using high-level theory to explain the experimental results. The data show a general structural trend: Anthraquinones with 1,4-OH substitution are long-lived and prone to damaging ET, while excited state intramolecular proton transfers promote efficient quenching for hydroxyanthraquinones that lack this motif.

Electron Transfer and Ligand Addition to Atomic Mercury Cations in the Gas Phase:  Kinetic and Equilibrium Studies at 295 K

2006 ◽  
Vol 45 (24) ◽  
pp. 9646-9653 ◽  
Author(s):  
Xiang Zhao ◽  
Eric Flaim ◽  
Lise Huynh ◽  
Michael J. Y. Jarvis ◽  
Ping Cheng ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Gas Phase ◽  
Equilibrium Studies ◽  
Ligand Addition ◽  
Atomic Mercury
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