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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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All conjugated copolymer excitonic multiferroics.

Jessica Lohrman1, Yueying Liu, Shaofeng Duan

  • 1Department of Chemistry, University of Kansas, Lawrence, 66045, USA.

Advanced Materials (Deerfield Beach, Fla.)
|November 23, 2012
PubMed
Summary

Researchers report a significant magnetoelectric coupling in excitonic multiferroics made from all-conjugated block copolymers. This discovery advances the synthesis of multifunctional copolymers and the development of electric field-tunable multiferroic devices.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Condensed Matter Physics

Background:

  • Multiferroic materials exhibit multiple ferroic orders, offering potential for advanced electronic devices.
  • All-conjugated block copolymers present a versatile platform for designing novel functional materials.
  • Excitonic coupling in polymers can lead to unique electronic and magnetic properties.

Purpose of the Study:

  • To investigate the magnetoelectric coupling effect in a novel multiferroic system.
  • To explore the synthesis of multifunctional all-conjugated block copolymers.
  • To demonstrate the potential for electric field-tunable multiferroic devices.

Main Methods:

  • Synthesis of all-conjugated block copolymers from electronically distinct polythiophene derivatives.
  • Characterization of the material's structural, electronic, and magnetic properties.
  • Measurement of magnetoelectric coupling coefficients under varying electric fields.

Main Results:

  • A substantial magnetoelectric coupling effect was observed in the excitonic all-conjugated block copolymer multiferroics.
  • The distinct electronic nature of the polythiophene derivatives contributes to the observed coupling.
  • The material demonstrated tunability of its multiferroic properties via electric fields.

Conclusions:

  • The study reports a significant magnetoelectric coupling in a new class of excitonic multiferroic materials.
  • The findings pave the way for the development of multifunctional all-conjugated block copolymers.
  • This research opens new avenues for designing electric field-tunable multiferroic devices.