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Related Concept Videos

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Conformations of Cyclohexane02:11

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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.9K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
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Capturing nonclassical C70 with double heptagons in low-pressure combustion.

Fang-Fang Xie1, Zuo-Chang Chen1, Min Zhang1

  • 1State Key Lab for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China. sldeng@xmu.edu.cn.

Chemical Communications (Cambridge, England)
|August 17, 2022
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Summary

A novel fullerene, dihept-C70H6, featuring a double-heptagon structure, was identified in combustion soot. This discovery marks the first nonclassical fullerene isolable from both carbon arc and combustion environments.

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Area of Science:

  • Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Fullerenes are allotropes of carbon with unique cage-like structures.
  • Nonclassical fullerenes exhibit unusual cage topologies and properties.
  • Previous isolation of dihept-C70Cl6 demonstrated the existence of double-heptagon fullerenes.

Purpose of the Study:

  • To isolate and characterize a new fullerene derivative from combustion soot.
  • To confirm the presence of double-heptagon structures in different carbon production methods.
  • To establish dihept-C70H6 as the first nonclassical fullerene isolable from both carbon arc and combustion.

Main Methods:

  • Low-pressure combustion synthesis of carbon materials.
  • Soot extraction and purification techniques.
  • Unambiguous structural characterization using advanced spectroscopic and analytical methods.

Main Results:

  • Isolation and definitive characterization of a double-heptagon-containing C70H6 (dihept-C70H6).
  • Confirmation that dihept-C70H6 shares the same heptagonal cage structure as dihept-C70Cl6.
  • Demonstration of dihept-C70H6 isolability from low-pressure combustion soot.

Conclusions:

  • Dihept-C70H6 represents a significant finding in fullerene chemistry.
  • The ability to isolate this nonclassical fullerene from combustion expands production possibilities.
  • This study establishes a precedent for nonclassical fullerenes being accessible through multiple synthetic routes.