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Related Concept Videos

Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

2.5K
Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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Radicals01:27

Radicals

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Roots, often written as radicals, identify the quantity that must be raised to a specific exponent to produce a given value. A radical expression consists of two main components: the radicand, which is the value placed inside the root symbol, and the index, which indicates the degree of the root being taken. The notation n√a indicates the principal nth root of a. If n equals 2, the operation is the square root, while n = 3 defines the cube root. When n is even, a negative radicand does...
730
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.7K
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...
3.7K
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...
3.8K
Radical Equations01:26

Radical Equations

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Radical equations are mathematical expressions in which the variable is found within a radical, most commonly a square root or cube root. These equations frequently arise in science, engineering, and real-world measurements involving nonlinear relationships. To solve a radical equation, the standard procedure is to isolate the radical expression and then eliminate the radical by raising each side to a power equal to the index of the radical. This process may lead to extraneous...
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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
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Magnetoelectric Radical Hydrocarbons.

Ying-Shi Guan1,2, Guohua Zhong3, Yong Hu1,2

  • 1Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA.

Advanced Materials (Deerfield Beach, Fla.)
|November 22, 2018
PubMed
Summary
This summary is machine-generated.

Researchers report new molecular radical hydrocarbon solids exhibiting ferroelectricity and magnetic spin exchange coupling. These novel magnetoelectrics show significant photoconductance and photovoltaic effects, enabling control over magnetic and electrical properties for advanced applications.

Keywords:
ferroelectricityhydrocarbonsmagnetoelectricsmolecular radicals

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Organic Electronics

Background:

  • Molecular radicals, systems with unpaired electrons, are crucial for exploring open-shell electronic structures.
  • Cooperative magnetic exchange interactions and magnetoelectric effects are key areas in multidisciplinary science.

Purpose of the Study:

  • To report ferroelectricity and magnetic spin exchange coupling in molecular radical hydrocarbon solids.
  • To investigate the role of electronic correlation in coupling magnetic and charge orders.
  • To explore the optoelectronic properties of these novel materials.

Main Methods:

  • Synthesis and characterization of molecular radical hydrocarbon solids.
  • Investigation of magnetic and electrical properties.
  • Measurement of photoconductance and photovoltaic effects.

Main Results:

  • Demonstration of ferroelectricity coupled with magnetic spin exchange in molecular radical hydrocarbon solids.
  • Identification of electronic correlation via radical-radical interactions as key to coupling magnetic and charge orders.
  • Observation of substantial photoconductance and visible-light photovoltaic effects.

Conclusions:

  • A new class of molecular radical magnetoelectrics has been developed.
  • Simultaneous control and retrieval of magnetic and electrical responses are achievable.
  • These materials offer potential applications in radical magnetoelectrics, magnets, and optoelectronics.