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Remote chirality transfer in low-dimensional hybrid metal halide semiconductors
Md Azimul Haque1, Andrew Grieder2, Steven P Harvey1
1National Renewable Energy Laboratory, Golden, CO, USA.
Nature Chemistry
|October 25, 2024
Summary
Chiral molecules can now induce chirality in hybrid metal halide semiconductors without being part of the structure. This remote chirality transfer offers new ways to control material properties for advanced applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Organic Chemistry
Background:
- Chiroptical properties in hybrid metal halides usually require chiral organic cations integrated into the crystal structure.
- This integration limits compositional flexibility and material design options.
Purpose of the Study:
- To demonstrate efficient remote chirality transfer to achiral hybrid metal halide semiconductors.
- To explore a new method for imparting chiroptical properties without structural integration.
Main Methods:
- Utilizing proximal chiral molecules to induce chirality in hybrid metal halide semiconductors.
- Employing density functional theory (DFT) calculations to understand the mechanism of chirality transfer.
- Investigating the influence of chiral molecule anchoring on the inorganic lattice structure.
Main Results:
- Achieved highly efficient remote chirality transfer with large circular dichroism dissymmetry factors (gCD) up to 10-2.
- DFT calculations revealed that chiral molecules transfer stereochemical information via selective interaction with metal cations.
- Observed centro-asymmetric distortion extending up to four inorganic layers into the lattice.
Conclusions:
- Remote chirality transfer is a viable strategy for imparting chiroptical properties to hybrid metal halides.
- This approach decouples composition from chirality, enabling independent control.
- The concept is applicable to various dimensionalities (1D, 2D) of hybrid metal halides.
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