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¹³C NMR: ¹H–¹³C Decoupling

¹³C NMR: ¹H–¹³C Decoupling

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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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Related Experiment Video

Updated: Jun 24, 2025

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Unit-Emitting Carbon Dots.

Yunsheng Xia¹, Yanli Xu¹

¹Anhui Province Key Laboratory of Biomedical Materials and Chemical Measurement, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China.

The Journal of Physical Chemistry Letters

|June 13, 2024

Summary

This summary is machine-generated.

This study confirms the emitting-unit model for carbon dots (C-dots). Different C-dots from the same precursor originate from the same photoluminescent polycyclic aromatic hydrocarbon units.

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Last Updated: Jun 24, 2025

Compact Quantum Dots for Single-molecule Imaging

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Correlative Light- and Electron Microscopy Using Quantum Dot Nanoparticles

Correlative Light- and Electron Microscopy Using Quantum Dot Nanoparticles

Published on: August 7, 2016

Area of Science:

Materials Science
Nanotechnology
Spectroscopy

Background:

Understanding carbon dot (C-dot) photoluminescence is crucial for their applications.
The emitting-unit model proposes specific molecular structures responsible for C-dot luminescence.

Purpose of the Study:

To verify the emitting-unit model of C-dots using an advanced contrastive analysis approach.
To investigate the origin of photoluminescence in C-dots derived from ortho-aminophenol.

Main Methods:

Preparative thin-layer chromatography and polyamide column chromatography for C-dot separation.
Comprehensive experimental characterizations, including electrospray ionization mass spectrometry (ESI-MS).

Main Results:

Four highly correlative C-dots were isolated from a single homologous sample.
Direct ESI-MS evidence confirmed that all four C-dots share the same polycyclic aromatic hydrocarbon emitting units.
Despite differing chemical compositions, the photoluminescence originates from these common units.

Conclusions:

The emitting-unit model of C-dots is validated.
The study demonstrates that variations in C-dot composition do not necessarily alter the fundamental photoluminescent species.
This finding has significant implications for designing and controlling C-dot properties for various applications.