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With CdTe as a model system, we show that substances form and isomerize prior to the nucleation and growth of QDs. Called precursor compounds (PCs), the prenucleation clusters are relatively optically transparent and can transform to absorbing magic\u2010size clusters (MSCs). When a prenucleation\u2010stage sample at 25, 45, or 80\u2009\u00b0C is dispersed in a mixture of cyclohexane (CH) and octylamine (OTA) at room temperature, either MSC\u2010371, MSC\u2010417, or MSC\u2010448 evolves with absorption peaking at 371, 417, or 448\u2005nm, respectively. We propose that PC\u2010371 forms at 25\u2009\u00b0C, and isomerizes to PC\u2010417 at 45\u2009\u00b0C and to PC\u2010448 at 80\u2009\u00b0C. The PCs and MSCs are quasi isomers. Relatively large and small amounts of OTA favor PC\u2010371 and PC\u2010448 in dispersion, respectively. The present findings suggest the existence of PC\u2010to\u2010PC isomerization in the QD prenucleation stage.<\/jats:p>","DOI":"10.1002\/anie.202310234","type":"journal-article","created":{"date-parts":[[2023,8,16]],"date-time":"2023-08-16T07:32:24Z","timestamp":1692171144000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Thermally\u2010Induced Isomerization of Prenucleation Clusters During the Prenucleation Stage of CdTe Quantum Dots"],"prefix":"10.1002","volume":"62","author":[{"given":"Tinghui","family":"Wang","sequence":"first","affiliation":[{"name":"Engineering Research Center in Biomaterials Sichuan University  610065 Chengdu Sichuan P.\u2005R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhe","family":"Wang","sequence":"additional","affiliation":[{"name":"Engineering Research Center in Biomaterials Sichuan University  610065 Chengdu Sichuan P.\u2005R. 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