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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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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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Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
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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.
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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Decoding Carbon Dot Purity by Nuclear Magnetic Resonance.

Yalei Hu1, Alberto Bianco1

  • 1CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572, University of Strasbourg, ISIS, France.

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|May 1, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new method using dialysis and NMR to purify and assess carbon dots (CDs). This technique helps understand CD structure and fluorescence by reliably measuring their purity.

Keywords:
NMRcarbon materialsdialysisgraphene

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Carbon dots (CDs) are increasingly studied but face challenges due to unclear atomic structure and fluorescence mechanisms.
  • Effective purification and purity assessment are crucial for advancing CD applications.

Purpose of the Study:

  • To develop a standardized and quantitative method for assessing the purity of carbon dots (CDs).
  • To evaluate the effectiveness of purification techniques for CDs.

Main Methods:

  • Synthesized two types of CDs (citric acid-ethylenediamine and citric acid-p-phenylenediamine derived) using hydrothermal treatment.
  • Employed dialysis for purification and Nuclear Magnetic Resonance (NMR) spectroscopy for purity assessment.
  • Characterized purified CDs using microscopy and spectroscopy.

Main Results:

  • Dialysis effectively removed impurities from crude CD products, indicated by decreasing retentate mass and attenuated sharp peaks in NMR spectra.
  • A plateau in the ratio of integrated broad to sharp peaks in NMR spectra correlated with successful purification.
  • Established a linear correlation between CD purity and the integrated peak ratios, enabling semi-quantitative analysis.

Conclusions:

  • The combined dialysis and NMR approach provides a reliable method for assessing carbon dot purity.
  • This methodology allows for systematic differentiation and quantification of CDs and impurities.
  • Addresses a key limitation in previous carbon dot characterization, paving the way for further research and applications.