CBe₄H₆: a molecular rotor with a built-in on-off switch

Area of Science:

• Materials Science
• Computational Chemistry
• Nanotechnology

Background:

• Controlling molecular rotors typically requires difficult chemical modifications.
• Existing methods for stopping and resuming intramolecular rotation are complex and often irreversible.

Purpose of the Study:

• To design and investigate a molecular rotor controllable without chemical manipulation.
• To explore the temperature-dependent switching mechanism of intramolecular rotation.

Main Methods:

• First-principles molecular dynamics simulations.
• Analysis of electronic structure and bonding configurations.

Main Results:

• The CBe4H6 molecule exhibits controllable intramolecular rotation.
• Rotation is active at high temperatures (600-1000 K) and inhibited at room temperature (298 K).
• Switching is achieved by altering the configuration of C-H bonds, affecting delocalized σ bonding.

Conclusions:

• CBe4H6 offers a novel, chemically independent method for controlling molecular rotors.
• The molecule is thermodynamically favorable and electronically stable, suggesting potential for synthesis.
• This discovery opens avenues for advanced molecular devices and nanotechnology.