Leveraging Halogen Interactions for a Supramolecular Nanotube.

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Crystal Engineering

Background:

• Supramolecular chemistry focuses on non-covalent interactions to assemble molecules.
• Templating supramolecular structures often relies on solvent-mediated interactions.
• Controlling intermolecular forces within macrocycles is crucial for ordered self-assembly.

Purpose of the Study:

• To demonstrate the formation of supramolecular nanotubes from molecular triangles within a single crystal.
• To investigate the role of hydrogen bonds and halogen interactions in templating nanotube growth.
• To establish a method for rational design of 1D tubular materials using intrinsic molecular interactions.

Main Methods:

• Single crystal X-ray diffraction analysis to study molecular packing and interactions.
• Quantum chemical calculations to understand the nature and interplay of intermolecular forces.
• Systematic modification of macrocycles by substituting bromine with iodine.

Main Results:

• Successful formation of supramolecular nanotubes templated by macrocycle-encoded interactions.
• Demonstrated that replacing bromine with iodine enhances halogen bonding and suppresses hydrogen bonding.
• Identified specific intermolecular interactions governing the 1D tubular organization.

Conclusions:

• Supramolecular nanotube formation can be achieved by balancing hydrogen and halogen bonds within macrocycles.
• Intrinsic molecular interactions provide a robust method for templating self-assembly, independent of solvent effects.
• This approach offers a new strategy for designing materials with controlled one-dimensional structures.