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Related Concept Videos

Solvating Effects02:12

Solvating Effects

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An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Leveling Effect01:29

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In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the...
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
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SN1 Reaction: Mechanism02:25

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
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Acid Halides to Esters: Alcoholysis01:12

Acid Halides to Esters: Alcoholysis

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Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Steric effects in light-induced solvent proton abstraction.

Jurick Lahiri1, Mehdi Moemeni, Ilias Magoulas

  • 1Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA. babak@chemistry.msu.edu piecuch@chemistry.msu.edu jackson@chemistry.msu.edu blanchard@chemistry.msu.edu dantus@chemistry.msu.edu.

Physical Chemistry Chemical Physics : PCCP
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Solvent structure significantly impacts excited-state proton transfer (ESPT) in Schiff bases. Steric hindrance in secondary and tertiary alcohols inhibits ESPT, unlike primary alcohols, due to hydrogen-bonded complex formation.

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Area of Science:

  • Photochemistry
  • Physical Chemistry
  • Organic Chemistry

Background:

  • Excited-state proton transfer (ESPT) is crucial in chemical reactions.
  • Schiff bases are important organic compounds with diverse applications.
  • Solvent effects play a significant role in reaction dynamics.

Purpose of the Study:

  • To investigate the influence of solvent structural factors on ESPT reactions.
  • To elucidate the role of steric hindrance in alcohol solvents during ESPT.
  • To understand the mechanism of proton transfer involving Schiff bases and alcohols.

Main Methods:

  • Utilized a super photobase (FR0-SB) and various alcohol solvents (primary, secondary, tertiary).
  • Employed steady-state and time-resolved fluorescence spectroscopy.
  • Performed quantum chemistry calculations to determine barrier heights.

Main Results:

  • ESPT occurred readily in primary alcohols, correlating with -OH concentration.
  • ESPT was significantly diminished in secondary alcohols, aligning with calculated barrier heights.
  • No ESPT was observed in tertiary alcohols.

Conclusions:

  • Solvent structure and steric factors critically control ESPT in Schiff bases.
  • ESPT proceeds via an intermediate hydrogen-bonded complex dependent on solvent proximity and alignment.
  • The findings provide insights into controlling photochemical reactions through solvent design.