scholarly journals Two‐step Two‐intermediate Photorelease Bolm‐McCulla Reaction: Dual Release of Nitrene and Atomic Oxygen Reactive Intermediates

2021 ◽  
Author(s):  
Mahir Rashid ◽  
Devora D. Baker ◽  
Alexander Greer
Keyword(s):  
Atomic Oxygen ◽  
Reactive Intermediates ◽  
Dual Release

Reactions of the atomic oxygen radical anion and the synthesis of organic reactive intermediates

1992 ◽  
Vol 92 (7) ◽  
pp. 1611-1647 ◽  
Author(s):  
Jeehiun Lee ◽  
Joseph J. Grabowski
Keyword(s):  
Radical Anion ◽  
Atomic Oxygen ◽  
Reactive Intermediates ◽  
Oxygen Radical

The origin of light emission in the atomic hydrogen—acetylene flame

1964 ◽  
Vol 282 (1389) ◽  
pp. 275-282 ◽  
Keyword(s):  
Gas Phase ◽  
Atomic Hydrogen ◽  
Atomic Oxygen ◽  
Light Emission ◽  
Reactive Intermediates ◽  
Hydrogen Atoms ◽  
Electronically Excited ◽  
Catalytic Recombination ◽  
Oxygen Atoms

Acetylene catalyzes the gas phase recombination of hydrogen atoms, and frequently the reaction is accompanied by a bright flame. It is shown that the light emission is not the result of the catalytic recombination, but is caused by traces of water in the hydrogen. The possible reactive intermediates, OH, HO 2 and atomic oxygen, have been individually generated and added to the mixture of hydrogen atoms and acetylene. Only oxygen atoms are effective in causing luminescence. Hydrogen atoms are not necessary for light emission, but they do alter the spectrum somewhat. Two different mechanisms for the formation of electronically excited C 2 are required. The mechanism for the reaction of atomic oxygen with acetylene is discussed.

ChemInform Abstract: Reactions of the Atomic Oxygen Radical Anion and the Synthesis of Organic Reactive Intermediates

ChemInform ◽  
2010 ◽  
Vol 24 (22) ◽  
pp. no-no
Author(s):  
J. LEE ◽  
J. J. GRABOWSKI
Keyword(s):  
Radical Anion ◽  
Atomic Oxygen ◽  
Reactive Intermediates ◽  
Oxygen Radical

Nanoscale Study of the Influence of Atomic Oxygen on the Electrical Properties of LaAlO3 Thin High-k Oxide Films Deposited by Molecular Beam Epitaxy

2009 ◽  
Author(s):  
Wael Hourani ◽  
Liviu Militaru ◽  
Brice Gautier ◽  
David Albertini ◽  
Armel Descamps-Mandine ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Molecular Beam Epitaxy ◽  
Atomic Oxygen ◽  
Molecular Beam ◽  
Oxide Films ◽  
High K

Radical Enzymes Control the Chemistry of Their Highly Reactive Intermediates Using the Quantum Coulombic Effect

2020 ◽  
Author(s):  
Hossein Khalilian ◽  
Gino A. DiLabio
Keyword(s):  
Hydrogen Bonding ◽  
Molecular Orbital ◽  
Reactive Intermediates ◽  
Hydrogen Bonding Interaction ◽  
Orbital Ordering ◽  
Dynamic Nature ◽  
Radical Intermediate ◽  
Highest Occupied Molecular Orbital ◽  
Bonding Interaction ◽  
Close Proximity

Here, we report an exquisite strategy that the B12 enzymes exploit to manipulate the reactivity of their radical intermediate (Adenosyl radical). Based on the quantum-mechanic calculations, these enzymes utilize a little known long-ranged through space quantum Coulombic effect (QCE). The QCE causes the radical to acquire an electronic structure that contradicts the Aufbau Principle: The singly-occupied molecular orbital (SOMO) is no longer the highest-occupied molecular orbital (HOMO) and the radical is unable to react with neighbouring substrates. The dynamic nature of the enzyme and its structure is expected to be such that the reactivity of the radical is not restored until it is moved into close proximity of the target substrate. We found that the hydrogen bonding interaction between the nearby conserved glutamate residue and the ribose ring of Adenosyl radical plays a crucial role in manipulating the orbital ordering

Radical Enzymes Control the Chemistry of Their Highly Reactive Intermediates Using the Quantum Coulombic Effect

2020 ◽  
Author(s):  
Hossein Khalilian ◽  
Gino A. DiLabio
Keyword(s):  
Hydrogen Bonding ◽  
Molecular Orbital ◽  
Reactive Intermediates ◽  
Hydrogen Bonding Interaction ◽  
Orbital Ordering ◽  
Dynamic Nature ◽  
Radical Intermediate ◽  
Highest Occupied Molecular Orbital ◽  
Bonding Interaction ◽  
Close Proximity

Here, we report an exquisite strategy that the B12 enzymes exploit to manipulate the reactivity of their radical intermediate (Adenosyl radical). Based on the quantum-mechanic calculations, these enzymes utilize a little known long-ranged through space quantum Coulombic effect (QCE). The QCE causes the radical to acquire an electronic structure that contradicts the Aufbau Principle: The singly-occupied molecular orbital (SOMO) is no longer the highest-occupied molecular orbital (HOMO) and the radical is unable to react with neighbouring substrates. The dynamic nature of the enzyme and its structure is expected to be such that the reactivity of the radical is not restored until it is moved into close proximity of the target substrate. We found that the hydrogen bonding interaction between the nearby conserved glutamate residue and the ribose ring of Adenosyl radical plays a crucial role in manipulating the orbital ordering

Survey for Transition of Normal Reaction

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Hassan Akbari Rahimi
Keyword(s):  
Transition State ◽  
Reactive Intermediates ◽  
The State ◽  
Energy Profile ◽  
Normal Reaction ◽  
Unstable Molecules ◽  
The Difference ◽  
Bond Vibration ◽  
Unstable Molecule ◽  
Profile Diagram

Transition of reaction is a short-lived unstable molecule in a reaction which is formed in between the reaction when reactants change into products. Whereas, transition state is just the state before formation of new molecule (involves breaking of bonds of reactants and formation of new ones) Transition of reaction differs from a transition state in that the intermediate has a discrete lifetime (be it a few nanoseconds or many days), whereas a transition state lasts for just one bond vibration cycle. Intermediates may be unstable molecules (in which case they are called reactive intermediates) or highly stable molecules. The difference between them can be better described through the energy profile diagram.

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