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Related Concept Videos

Polymers02:34

Polymers

40.6K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Conjugated Proteins02:50

Conjugated Proteins

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
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Conjugated Proteins02:50

Conjugated Proteins

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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Taping Over Different Ground Profiles01:12

Taping Over Different Ground Profiles

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Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.0K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
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Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates

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A high-spin ground-state donor-acceptor conjugated polymer.

A E London1, H Chen2, M A Sabuj3

  • 1Center for Optoelectronic Materials and Devices, School of Polymer Science and Engineering, The University of Southern Mississippi, Hattiesburg, MS 39406, USA.

Science Advances
|May 30, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a stable, high-spin organic semiconductor. This breakthrough enables new technologies integrating spin, magnetic, and quantum functionalities in organic materials.

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Area of Science:

  • Organic electronics
  • Materials science
  • Quantum chemistry

Background:

  • High-spin organic materials offer potential for advanced technologies but suffer from instability, hindering synthesis and application.
  • Understanding the link between chemical bonding, electron pairing, and practical properties in organic systems remains a challenge.

Purpose of the Study:

  • To synthesize and characterize a stable, ground-state triplet conjugated polymer semiconductor.
  • To explore the potential of this material for applications requiring spin, magnetic, and quantum functionalities.

Main Methods:

  • Synthesis of a conjugated polymer semiconductor featuring alternating cyclopentadithiophene and thiadiazoloquinoxaline units.
  • Characterization using electron paramagnetic resonance (EPR) and magnetic susceptibility measurements.

Main Results:

  • Demonstrated a novel conjugated polymer semiconductor that is a ground-state triplet in its neutral form.
  • Quantified a high-to-low spin energy gap of 9.30 × 10-3 kcal mol-1.
  • Observed a strongly correlated electronic structure, narrow bandgap, intramolecular ferromagnetic coupling, high electrical conductivity, and robust stability.

Conclusions:

  • The developed material overcomes the intrinsic instability issues of previous high-spin organic materials.
  • Its unique properties, including high conductivity and stability, open avenues for diverse technological applications previously inaccessible to organic semiconductors.