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Radical Reactivity: Overview01:11

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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Radicals: Electronic Structure and Geometry01:07

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
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Radical Formation: Addition00:47

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Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
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Multistructural Anharmonicity Controls the Radical Generation Process in Biofuel Combustion.

Lili Xing1,2, Zhandong Wang3, Donald G Truhlar2

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This study calculates reaction rates for isopentanol with OH radicals, crucial for understanding biofuel combustion and atmospheric chemistry. Findings highlight the importance of advanced computational methods for accurate kinetic data.

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Area of Science:

  • Combustion Chemistry
  • Atmospheric Chemistry
  • Computational Chemistry

Background:

  • Isopentanol is a sustainable biofuel with complex combustion chemistry.
  • Experimental data on isopentanol's reaction kinetics with OH radicals is limited.
  • Understanding these reactions is vital for both atmospheric degradation and combustion modeling.

Purpose of the Study:

  • To calculate rate constants and branching fractions for the hydrogen abstraction reaction of isopentanol by OH radicals.
  • To cover a wide temperature range relevant to atmospheric chemistry and combustion.
  • To provide essential thermochemical and kinetic data for isopentanol.

Main Methods:

  • Utilized multipath variational transition state theory (MP-VTST).
  • Combined with electronic structure calculations to determine thermochemical data.
  • Incorporated multidimensional tunneling, multiple-structure anharmonicity, and torsional potential anharmonicity for accurate rate calculations.

Main Results:

  • Calculated site-dependent rate constants and branching fractions for isopentanol-OH reactions.
  • Determined previously unavailable thermochemical data.
  • Demonstrated the significant impact of recrossing, tunneling, and multiple structures on reaction rates.

Conclusions:

  • Multiple structure anharmonicity is the most critical correction to conventional transition state theory for this system.
  • Recrossing effects and tunneling significantly influence reaction rates and require accurate treatment.
  • The generated data is indispensable for atmospheric alcohol degradation and biofuel combustion mechanism prediction.