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Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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Compact Quantum Dots for Single-molecule Imaging
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Solvatochromic Carbon Dots.

Zhiwen Li1, Tianli Huang1, Jiancong Zheng2

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

The Journal of Physical Chemistry Letters
|January 1, 2026
PubMed
Summary

Carbon dots (C-dots) exhibit solvatochromism due to their intrinsic charge distribution. Donor-π-acceptor configurations enable distinct solvatochromism, dependent on donor-acceptor ratios, while other configurations show minimal shifts.

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Area of Science:

  • Materials Science
  • Photophysics
  • Nanotechnology

Background:

  • Solvatochromism in carbon dots (C-dots) is crucial for fundamental understanding and applications.
  • Existing research has open questions regarding the precise photophysical mechanisms and structure-dependent solvatochromic behavior of C-dots.

Purpose of the Study:

  • To elucidate the relationship between the composition, structure, and solvatochromic properties of carbon dots.
  • To identify the specific molecular configurations responsible for distinct solvatochromism in C-dots.

Main Methods:

  • Isolation and purification of four distinct types of carbon dots using advanced separation techniques.
  • Quantitative analysis and comparative study of the photophysical properties of purified C-dots in various solvents.
  • Investigation of charge distribution and intramolecular charge transfer effects within C-dots.

Main Results:

  • Solvatochromic behavior of C-dots is directly linked to their intrinsic charge distribution.
  • C-dots with a donor-π-acceptor configuration exhibit significant solvatochromism driven by intramolecular charge transfer.
  • The direction and magnitude of spectral shifts in C-dots are tunable by altering the ratios of donor to acceptor components.

Conclusions:

  • The donor-π-acceptor configuration is essential for pronounced solvatochromism in carbon dots.
  • C-dots lacking this specific configuration (donor-π or acceptor-π) display negligible solvatochromic effects due to limited charge transfer.
  • Understanding charge distribution provides a pathway to engineer C-dots with tailored photophysical properties.