Wide-range light-harvesting donor-acceptor assemblies through specific intergelator interactions via self-assembly

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Photophysics

Background:

• Low-molecular-mass organogelators (LMOGs) are crucial for developing advanced materials.
• Donor-acceptor (D-A) systems enable control over molecular interactions and macroscopic properties.
• Tri-p-phenylene vinylene (TPV) derivatives offer unique photophysical and self-assembly characteristics.

Purpose of the Study:

• To synthesize and characterize novel D-A TPV-based organogelators.
• To investigate intergelator interactions and their influence on gel properties.
• To explore energy transfer dynamics in D-A assemblies and multi-chromophore systems.

Main Methods:

• Synthesis of TPV-based donor and acceptor molecules.
• Gelation studies in organic solvents.
• Spectroscopic (UV-Vis, fluorescence) and microscopic (SEM, TEM) characterization.
• Thermal (DSC, TGA) and mechanical analysis.
• Photophysical studies including solvatochromism and aggregation behavior.

Main Results:

• Successful synthesis of two TPV-based LMOGs (donor and acceptor).
• Formation of stable gels through intermolecular interactions (H-bonding, π-stacking, van der Waals).
• Observation of photochromism, solvatochromism, and J-type aggregation.
• Demonstration of efficient energy transfer in D-A mixtures and a four-chromophore cascade (anthracene-donor-acceptor-rhodamine 6G).

Conclusions:

• Donor-acceptor self-assembly provides effective control over organogelator properties.
• The synthesized TPV derivatives exhibit promising photophysical properties for energy transfer applications.
• The observed energy transfer cascade in a multi-chromophore system highlights potential for artificial light-harvesting applications.