Noncovalent interactions between organometallic metallocene complexes and single-walled carbon nanotubes

Area of Science:

• Materials Science
• Computational Chemistry
• Nanotechnology

Background:

• Transition metal metallocene complexes (MCp2) are of interest for functionalizing carbon nanomaterials.
• Single-walled carbon nanotubes (SWNTs) offer unique electronic and mechanical properties.

Purpose of the Study:

• Investigate interactions between MCp2 and SWNTs.
• Determine the influence of SWNT diameter on these interactions.
• Characterize the nature and magnitude of binding forces.

Main Methods:

• First principles density functional pseudopotential calculations.
• Theoretical modeling of MCp2-graphene, MCp2@(17,0) SWNT, and MCp2@(12,0) SWNT composites.
• Analysis of electronic structure and charge transfer.

Main Results:

• MCp2@SWNT composites are stabilized by pi-stacking and CH...pi interactions.
• Cobalt metallocene complexes show additional electrostatic stabilization due to charge transfer to the SWNT.
• Charge transfer extent correlates with the relative energy levels of the metallocene HOMO and SWNT conduction band.

Conclusions:

• SWNT diameter influences the interaction strength and charge transfer in MCp2@SWNT composites.
• Understanding these interactions is key for designing novel hybrid nanomaterials.
• Computational methods provide valuable insights into molecular interactions at the nanoscale.