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Acids, Bases and Neutralization Reactions03:26

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An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
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Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
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Reactions of Acid Anhydrides01:19

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The reactions of acid anhydrides are analogous to the reactions of acid chlorides and proceed via a nucleophilic acyl substitution. They only differ in the identity of the leaving group. During an acid chloride reaction, the leaving group is a chloride ion, and the by-product is hydrochloric acid. However, in an acid anhydride reaction, the leaving group is a carboxylate ion, and the by-product is a carboxylic acid.
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Spectroscopy of Carboxylic Acid Derivatives01:26

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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
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Carboxylic acids possess an acidic –COOH functional group. The acidity can be attributed to the resonance stabilization of their conjugate base, wherein the negative charge is delocalized over both oxygen atoms.
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In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
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The Criegee intermediate-formic acid reaction explored by rotational spectroscopy.

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Summary

The reaction between CH2OO and formic acid forms hydroperoxymethyl formate. Two conformations were observed, suggesting independent insertion mechanisms and slight decomposition into formic anhydride.

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Area of Science:

  • Atmospheric Chemistry
  • Gas-Phase Kinetics
  • Spectroscopy

Background:

  • Criegee intermediates are key players in atmospheric oxidation processes.
  • Formic acid is a ubiquitous atmospheric trace gas.
  • Understanding reactions of simple Criegee intermediates is crucial for atmospheric modeling.

Purpose of the Study:

  • To investigate the gas-phase reaction between the simplest Criegee intermediate (CH2OO) and formic acid.
  • To identify the primary products and reaction mechanisms.
  • To characterize the structures of the formed species.

Main Methods:

  • Pulsed Fourier-transform microwave spectroscopy was employed.
  • A gas mixture of CH2I2/O2/formic acid was used in a discharged plasma.
  • Natural abundance 13C and deuterium isotopologues were analyzed.

Main Results:

  • The dominant product identified was hydroperoxymethyl formate (HOOCH2OCHO).
  • Two distinct conformations of hydroperoxymethyl formate were observed, indicating independent insertion pathways.
  • Evidence suggests slight decomposition of the product into formic anhydride (OHCOCHO) via dehydration.

Conclusions:

  • The reaction proceeds through insertion mechanisms, forming hydroperoxymethyl formate.
  • The observed conformations provide insights into the reaction's stereochemical pathways.
  • The formation of formic anhydride highlights secondary reaction pathways.