Cooperative Anion-π and C-H-Cl Interactions in Multifunctional Naphthalene-Based Receptors for Chloride Recognition:...

Area of Science:

• Supramolecular Chemistry
• Chemical Sensing
• Organic Chemistry

Background:

• Chloride ion recognition is crucial in environmental monitoring and biological systems.
• Developing selective and high-affinity anion receptors remains a significant challenge in chemistry.
• Naphthalene-based scaffolds offer versatile platforms for receptor design.

Purpose of the Study:

• To design and synthesize novel multifunctional naphthalene-based receptors for chloride ion recognition.
• To investigate the structure-binding relationships and enhance the binding affinity for chloride.
• To explore the underlying interaction mechanisms responsible for chloride capture.

Main Methods:

• Synthesis of naphthalene-based receptors with modified tetrafluoropyridine (TFP) units.
• Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy and Mass Spectrometry.
• Computational modeling using Density Functional Theory (DFT) to predict and understand binding affinities.
• Experimental determination of chloride binding affinities and selectivity.

Main Results:

• A series of novel naphthalene-based receptors were successfully synthesized.
• Experimental results confirmed the high efficacy of the receptors in capturing chloride ions.
• DFT calculations accurately predicted the experimental chloride affinity order.
• Synergistic anion-π and C-H…Cl interactions mediated by TFP groups were identified as key to high binding affinity.

Conclusions:

• The developed naphthalene-based receptors demonstrate excellent performance for chloride recognition.
• Strategic modification of TFP substitution patterns allows for customized receptor cavities and enhanced binding.
• The study provides a foundation for designing advanced anion receptors with superior performance.
• Understanding the role of specific non-covalent interactions is vital for optimizing receptor design.