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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.4K
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.
8.4K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.8K
Intermolecular Forces03:13

Intermolecular Forces

58.3K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.3K
Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

14.1K
Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
14.1K

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Related Experiment Video

Updated: Jun 29, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Water-Hydrocarbon Interactions in Anionic Pyrene Monohydrate.

Natalie LeMessurier1, Heinrich Salzmann1,2, River Leversee2,3

  • 1Department of Chemistry, University of Colorado, Boulder, Colorado 80309-0215, United States.

The Journal of Physical Chemistry. B
|March 25, 2024
PubMed
Summary

This study benchmarks computational methods for water-hydrocarbon interactions using pyrene monohydrate. Advanced sampling techniques reveal shortcomings in current models, highlighting the need to include electronic polarization and quantum nuclear effects for accurate simulations.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Water-hydrocarbon interactions are crucial in diverse chemical processes.
  • Intermolecular potentials for water-hydrocarbon systems are less developed than water-water potentials.
  • Experimental probes for water-hydrocarbon interactions are limited.

Purpose of the Study:

  • To present a combined experimental and computational study of anionic pyrene monohydrate.
  • To provide a rigorous benchmark for intermolecular potentials and computational methodologies.
  • To identify shortcomings in conventional dynamics calculations for water-hydrocarbon clusters.

Main Methods:

  • Action spectroscopy of mass-selected anionic pyrene monohydrate.
  • Density functional theory (DFT) and classical molecular dynamics (MD) calculations.
  • Augmented sampling techniques including parallel tempering in a soft sphere bath.

Main Results:

  • Kinetic trapping and slow equilibration observed in conventional MD simulations.
  • Augmented sampling improved simulation accuracy, reproducing spectral diffusion.
  • Discrepancies between simulation and experiment suggest missing electronic polarization and quantum nuclear effects.

Conclusions:

  • Conventional MD calculations exhibit limitations in simulating water-hydrocarbon interactions.
  • Electronic polarization and quantum nuclear effects are critical for accurate modeling.
  • The study provides a benchmark for future development of water-hydrocarbon intermolecular potentials.