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Related Concept Videos

Alkyl Halides02:45

Alkyl Halides

16.7K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
16.7K
Elimination Reactions02:25

Elimination Reactions

13.5K
A nucleophile can react with an alkyl halide to give the substitution product by displacing the halogen. Or it can function as a base to give the elimination product by deprotonation of the neighboring carbon to form an alkene. In an elimination reaction, the substrate loses two groups from adjacent carbons forming at least one π bond. The carbon attached to the halogen is called the α carbon, while the adjacent carbon is called the β carbon; hence, these reactions are called...
13.5K
Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

3.3K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
3.3K
SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

9.9K
An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
9.9K
Predicting Products: Substitution vs. Elimination02:52

Predicting Products: Substitution vs. Elimination

11.1K
When a nucleophile and an alkyl halide react, nucleophilic substitution and β-elimination reactions compete to generate products.
The following factors can influence the mechanisms competing against each other:
11.1K
Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

13.1K
Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
13.1K

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Thermal Ablation for the Treatment of Abdominal Tumors
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Cold ablation driven by localized forces in alkali halides.

Masaki Hada1, Dongfang Zhang2, Kostyantyn Pichugin2

  • 11] The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany [2] [3].

Nature Communications
|May 20, 2014
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Summary
This summary is machine-generated.

This study reveals that laser ablation in ionic crystals can occur below plasma formation thresholds. Fast electronic and structural changes drive particulate ejection and crater formation via repulsive forces.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Area of Science:

  • Materials Science
  • Laser Physics
  • Surface Science

Background:

  • Laser ablation is crucial for material processing, often relying on high-peak-power laser fluences above the plasma formation threshold (~1 J cm(-2)).
  • Understanding nonthermal ablation mechanisms is key for precise material modification and advanced applications.

Purpose of the Study:

  • To investigate the ultrafast dynamics of laser ablation in ionic crystals (NaCl, CsI, KI) below the plasma formation threshold.
  • To elucidate the mechanisms driving material removal and surface modification under specific laser excitation conditions.

Main Methods:

  • Single-shot time-resolved femtosecond electron diffraction.
  • Femtosecond optical reflectivity measurements.
  • Ion detection experiments following 400 nm femtosecond laser excitation.

Main Results:

  • Observed ablation phenomena well below the plasma formation threshold and melting point in crystalline ionic materials.
  • Detected rapid electronic and localized structural changes preceding material ejection.
  • Confirmed particulate ejection and the formation of micron-deep craters, indicative of strong repulsive forces.

Conclusions:

  • Femtosecond laser excitation can induce nonthermal ablation in ionic crystals at low fluences, distinct from plasma-mediated processes.
  • Ultrafast electronic and structural dynamics are critical drivers of material removal and cratering in this regime.
  • The findings offer new insights into laser-matter interactions for precise material processing and fundamental understanding.