Enhanced anion binding by heteroatom replacement in bambusurils

Area of Science:

• Supramolecular Chemistry
• Computational Chemistry
• Materials Science

Background:

• Bambusurils are macrocyclic compounds known for anion binding.
• Modifying bambusuril structures could enhance their anion recognition capabilities.

Purpose of the Study:

• To investigate the impact of heteroatom replacement in bambusurils on their anion binding properties.
• To explore the potential of modified bambusurils as synthetic anion channels.

Main Methods:

• Computational modeling and theoretical calculations.
• Analysis of molecular electrostatic potential and interaction energies.
• Structure-property relationship studies of bambusuril analogs.

Main Results:

• Heteroatom replacement significantly alters electrostatic potential and anion binding.
• Binding affinity follows the trend: Sulfur > Oxygen > NH.
• Replacements at portal carbonyls have a greater effect on induced dipole and binding than equatorial replacements.
• Protonated aza-bambusurils show potential for binding multiple anions and acting as anion channels.

Conclusions:

• Heteroatom substitution is a viable strategy to tune bambusuril anion binding.
• The electronic properties of heteroatoms dictate binding strength and selectivity.
• Modified bambusurils, particularly protonated aza-bambusurils, show promise for advanced anion sensing and transport applications.