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Updated: Nov 11, 2025
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Reversible Transformations at Room Temperature among Three Types of CdTe Magic-Size Clusters
Qiu Shen1, Chaoran Luan2, Nelson Rowell3
1Engineering Research Center in Biomaterials, Sichuan University, Sichuan 610065, P. R. China.
Inorganic Chemistry
|March 25, 2021
Summary
Researchers observed reversible transformations between three types of cadmium telluride magic-size clusters (MSCs) at room temperature. These CdTe MSCs transform via quasi-isomerization and substitution reactions, offering new insights into cluster dynamics.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Physics
Background:
- Cadmium telluride magic-size clusters (MSCs) exhibit unique optical properties.
- Controlling transformations between different cluster sizes is crucial for applications.
Purpose of the Study:
- To report the first observation of reversible transformations among CdTe MSCs.
- To elucidate the transformation pathway of these clusters at room temperature.
Main Methods:
- Preparation of CdTe prenucleation stage samples using cadmium oleate and tri-n-octylphosphine telluride.
- Dispersion of samples in toluene and primary amine mixtures.
- Monitoring optical absorption spectra to identify cluster types and transformations.
Main Results:
- Observed three types of OA-passivated CdTe MSCs with absorption peaks at 371, 417, and 448 nm.
- Identified distinct isosbestic points for transformations between MSC-371/MSC-417 (~385 nm) and MSC-417/MSC-448 (~430 nm).
- Demonstrated reversible transformations occurring at room temperature.
Conclusions:
- The observed transformations are enabled by precursor compounds (PCs).
- The pathway involves quasi-isomerization between PCs and their counterpart MSCs.
- Substitution reactions facilitate transformations between different PCs.
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