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Prenucleation Clusters Assisting Development of Two Photoluminescent CdTeS Magic-Size Clusters with Optical

Xi Zhou¹, Kui Yu¹, Yang Li¹

¹Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, P. R. China.

The Journal of Physical Chemistry Letters

|May 11, 2026

Summary

This study introduces chemical self-assembly for creating photoluminescent (PL) magic-size clusters (MSCs). Two types of CdTeS MSCs were synthesized, revealing a novel pathway for their evolution and formation.

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Area of Science:

Materials Science
Nanotechnology
Chemical Synthesis

Background:

Magic-size clusters (MSCs) are nanoscale materials with unique properties.
Understanding the formation pathways of photoluminescent (PL) MSCs is crucial for their applications.
Previous research has not fully elucidated the self-assembly evolution of ternary PL MSCs.

Purpose of the Study:

To propose and investigate the chemical self-assembly based evolution of photoluminescent ternary CdTeS MSCs.
To identify the key stages and intermediates in the formation of these MSCs.
To gain deeper insights into the developmental pathway of PL MSCs.

Main Methods:

Synthesis of CdTeS MSCs using a mixture of cadmium oleate, tri-n-octylphosphine telluride, bis(trimethylsilyl) sulfide, and acetic acid.
Characterization of the resulting MSCs, including optical absorption spectroscopy.
Analysis of the self-assembly process, including prenucleation cluster (PNC) formation and isomerization.

Main Results:

Two types of photoluminescent CdTeS MSCs, denoted MSC-427 and MSC-510, were successfully synthesized.
These MSCs exhibit distinct optical absorption doublets at 377/427 nm and 450/510 nm, respectively.
A proposed evolution pathway involves prenucleation clusters (PNCs) of CdTeS, isomerization to MSC-427, monomer addition to form PC-510, and subsequent isomerization to MSC-510.

Conclusions:

Chemical self-assembly provides a viable route for the formation of photoluminescent ternary CdTeS MSCs.
The study elucidates a step-by-step evolution pathway from molecular precursors to stable MSCs.
This work enhances the understanding of MSC formation mechanisms, paving the way for controlled synthesis.