| Résumé | Little is known about the pathway of room-temperature formation of ternary CdTeSe magic-size clusters (MSCs) obtained via mixing binary CdTe and CdSe induction period samples containing binary precursor compounds (PCs) of MSCs, monomers (Ms), and fragments (Fs). Also, unestablished are dispersion effects that occur when as-mixed samples (without incubation) are placed in toluene (Tol) and octylamine (OTA) mixtures. The resulting ternary MSCs, exhibiting sharp optical absorption peaking at 399 nm, are labelled "CdTeSe MSC-399", and their particular PCs are "CdTeSe PC-399". It is shown that when the amount of the primary amine (OTA) was relatively small, single-ensemble MSC-399 evolved without binary CdTe or CdSe MSCs. When the OTA amount was relatively large, CdTe MSC-371 appeared initially and then disappeared, while single-ensemble MSC-399 developed more deliberately. The larger the OTA amount was, the more slowly these changes proceeded. The substitution reaction of CdTe PC + CdSe M/F ⇔ CdTeSe PC-399 + CdTe M/F is proposed to be rate-determining for the MSC-399 formation in a Tol and OTA mixture. The present study provides further understanding regarding the transformation pathway between MSCs. |
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