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Related Concept Videos

Intermolecular Forces03:13

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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...
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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.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Formation of Water Networks on Anionic Perylene.

Heinrich Salzmann1,2, Natalie LeMessurier2, Joel D Eaves2

  • 1JILA, University of Colorado, Boulder, Colorado 80309-0440, United States.

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Water molecules form hydrogen bonds with perylene anions, creating distinct water networks. These networks exhibit dynamic behavior due to shallow potential energy surfaces, influencing cluster structures.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Understanding the interactions between aromatic molecules and water is crucial in various chemical and biological processes.
  • Investigating hydrated clusters provides insights into solvation phenomena and the initial steps of larger water-solute systems.

Purpose of the Study:

  • To characterize the structure and bonding of hydrated perylene anion clusters.
  • To investigate the role of hydrogen bonding in the formation of water networks around the perylene anion.
  • To explore the dynamics of these water networks using spectroscopic and computational methods.

Main Methods:

  • Infrared photodissociation spectroscopy was employed to probe the vibrational modes of hydrated perylene anion clusters.
  • Density functional theory (DFT) calculations were performed to determine electronic structures and model potential energy surfaces.
  • Temperature-dependent studies were conducted to observe dynamic effects.

Main Results:

  • Hydrated perylene anion clusters were successfully synthesized and characterized for up to four water molecules.
  • Weak hydrogen bonds were observed between water molecules and the perylene anion's π system.
  • Stronger water-water hydrogen bonds were identified in larger clusters, leading to the formation of water subclusters.
  • Temperature-dependent dynamics revealed significant motion within the water network and shallow potential energy landscapes.

Conclusions:

  • Water molecules form distinct hydrogen-bonded networks on the perylene anion surface.
  • The strength of water-water interactions influences the overall cluster structure and dynamics.
  • The observed dynamics are attributed to the shallow potential energy surfaces governing the cluster configurations.