Molecular Programming of Diorganyl Dichalcogenides for Rational Nanocrystal Design.

Area of Science:

• Materials Science
• Nanotechnology
• Inorganic Chemistry

Background:

• Soft-chemistry nanocrystal synthesis uses low-temperature, solution-phase reactions.
• Reaction pathways are sensitive to molecular details of reactive species delivery.
• Programming precursor reactivity offers control over nanocrystal properties.

Purpose of the Study:

• To describe diorganyl dichalcogenides as a molecular platform for nanocrystal synthesis.
• To demonstrate how tuning precursor reactivity enables rational design of nanocrystals.
• To highlight the application of this approach for various metal chalcogenides.

Main Methods:

• Utilized diorganyl dichalcogenides (R-E-E-R) with tunable C-E bond strength.
• Investigated chalcogen release kinetics and speciation.
• Employed mechanistic studies and data-driven phase mapping for control.

Main Results:

• Diorganyl dichalcogenides provide molecular-level control over nucleation, growth, and phase evolution.
• Enabled synthesis of unary to quaternary metal chalcogenides and metastable phases.
• Demonstrated deterministic phase control of copper selenide intermediates for topotactic cation exchange.
• Extended the framework to non-close-packed alkali and alkaline earth metal chalcogenides.

Conclusions:

• Diorganyl dichalcogenides are a versatile and predictive molecular platform for soft-chemistry.
• Molecular programming of precursor reactivity allows for rational nanocrystal design.
• This approach expands accessible material spaces and facilitates discovery of new metastable phases.