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Two-layer molecular rotors: A zinc dimer rotating over planar hypercoordinate motifs
Rui Yu1, Gai-Ru Yan1, Yu-Qian Liu1
1Institute of Atomic and Molecular Physics, Jilin University, Changchun, China.
Journal of Computational Chemistry
|April 26, 2022
Summary
Researchers designed novel multi-layer molecular rotors using boron clusters and metal dimers. These structures exhibit unique barrier-free rotation, expanding the possibilities for fluxional materials.
Area of Science:
- Computational Chemistry
- Materials Science
- Nanotechnology
Background:
- Multi-layer molecular rotors are a unique class of compounds with barrier-free rotational dynamics between layers.
- Previous examples of these fluxional systems were primarily limited to a few doped boron clusters.
- Developing effective design strategies is crucial for expanding this class of molecules.
Purpose of the Study:
- To enrich the family of multi-layer molecular rotors through a systematic design strategy.
- To identify promising new candidates for two-layer molecular rotors.
- To confirm the electronic structure requirements for designing such systems.
Main Methods:
- Computational investigations of thermodynamic and kinetic stabilities for 60 potential cluster species.
- Analysis of electrostatic interactions, bonding characteristics, and electron delocalization.
- Electronic structure calculations to validate design principles.
Main Results:
- Identified key design factors: strong electrostatic interactions, absence of strong inter-layer covalent bonds, and delocalized σ/π electrons.
- Discovered that planar hypercoordinate boron rings with dual aromaticity can support suspended metal dimers (X2, X = Zn, Cd, Hg).
- Verified MB7X2− and MB8X2 clusters (with specific metal and dimer combinations) as global-minimum two-layer molecular rotors.
Conclusions:
- Successfully expanded the family of multi-layer molecular rotors with a novel design strategy.
- Confirmed the theoretical design principles for creating these unique fluxional molecules.
- The discovered rotors, such as MB7X2− and MB8X2, represent significant advancements in molecular machinery and materials science.
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