Diarylferrocene tweezers for cation binding.

Area of Science:

• Organometallic Chemistry
• Supramolecular Chemistry
• Computational Chemistry

Background:

• Ferrocene derivatives are versatile organometallic compounds.
• Host-guest chemistry involves the selective binding of guest molecules by host molecules.
• Understanding cation binding is crucial for molecular recognition and sensing.

Purpose of the Study:

• To investigate the host-guest chemistry of novel ferrocene derivatives.
• To explore the cation binding capabilities of 1-arylferrocenes and 1,1 '-diarylferrocenes.
• To elucidate the binding mechanisms and energetics using experimental and theoretical approaches.

Main Methods:

• Synthesis of 1-arylferrocenes and 1,1 '-diarylferrocenes via Suzuki-Miyaura cross-coupling.
• Experimental investigation of gas-phase cation binding using electrospray ionization mass spectrometry (ESI-MS).
• Quantum chemical calculations for evaluating relative interaction energies and understanding binding trends.

Main Results:

• 1,1 '-Diarylferrocenes demonstrated significant cation binding ability in the gas phase.
• 1-Arylferrocenes and unsubstituted ferrocene did not exhibit comparable cation binding.
• Cation binding interactions were found to follow electrostatic principles, with binding energies correlating with charge distribution.
• The unique molecular structure of 1,1 '-diarylferrocenes enables them to function as effective molecular tweezers for small cations.

Conclusions:

• 1,1 '-Diarylferrocenes are promising hosts for small cations in the gas phase.
• The observed cation binding is driven by electrostatic interactions and influenced by the ferrocene derivative's structure.
• This study provides insights into the design of novel host molecules for selective ion recognition.