Designing a "Flatter" ExBox(4+) Analogue

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Computational Chemistry

Background:

• ExBox(4+) 1 is a known host molecule for guest binding.
• Designing new host molecules with enhanced binding properties is crucial for various applications.
• Understanding host-guest interactions requires detailed structural and electronic analysis.

Purpose of the Study:

• To propose and computationally evaluate novel analogues of ExBox(4+) 1.
• To investigate the impact of "flatter" triaryl fragments on host-guest binding.
• To assess the binding affinity of new hosts towards small linear acenes.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• The ωB97X-D/6-311G(d,p) level of theory was used for predictions.
• Structural and electronic properties of host-guest complexes were analyzed.

Main Results:

• Two new host analogues with nearly flat triaryl fragments were proposed.
• These new hosts are predicted to bind five small linear acenes more tightly than ExBox(4+) 1.
• The flatter fragments lead to a less congested interior and improved π-π-stacking.

Conclusions:

• The proposed ExBox(4+) analogues demonstrate enhanced binding capabilities for linear acenes.
• Molecular design strategies focusing on fragment planarity can optimize host-guest interactions.
• Computational predictions provide a reliable basis for the development of new supramolecular hosts.