Dipole-moment-driven cooperative supramolecular polymerization.

Area of Science:

• Supramolecular chemistry
• Materials science
• Organic electronics

Background:

• Understanding intermolecular interactions is crucial for controlling the self-assembly of π-conjugated molecules into functional supramolecular polymers.
• The precise mechanisms governing self-assembly, particularly cooperative effects, remain incompletely understood.

Purpose of the Study:

• To investigate the self-assembly mechanism of perylene bisimide derivatives with dipolar carbonate linkers.
• To elucidate the role of intermolecular interactions, specifically dipole-dipole interactions, in driving cooperative self-assembly.
• To establish a framework for rational design and prediction of self-assembly in synthetic supramolecular polymers.

Main Methods:

• Synthesis of perylene bisimide derivatives featuring carbonate linkers and cholesterol/dihydrocholesterol moieties.
• Atomistic molecular dynamics simulations in explicit solvent to model the self-assembly process.
• Experimental characterization of bulk phase polarization in self-assembled materials.

Main Results:

• A cooperative self-assembly mechanism was observed when combining carbonate linkers with cholesterol/dihydrocholesterol groups.
• Molecular dynamics simulations indicated that dipole-dipole interactions between carbonate groups induce macro-dipolar character in the assembly.
• Experimental data confirmed significant bulk phase polarization in molecules exhibiting cooperative self-assembly.

Conclusions:

• Dipole-dipole interactions are key drivers of cooperative self-assembly in these perylene bisimide derivatives.
• Anisotropic long-range intermolecular interactions, like dipole-dipole forces, can be leveraged to achieve controlled cooperative self-assembly.
• This study provides insights for rational design and prediction of self-assembly mechanisms in synthetic supramolecular polymers.