Biosurfactant-functionalized porphyrin chromophore that forms J-aggregates

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Bioconjugation Chemistry

Background:

• Structurally tunable biosynthesized building blocks are crucial for self-organizing supramolecular systems.
• Sophorolipids (SLs) are versatile glycolipid biosurfactants with a modifiable sophorose head group.
• Porphyrins possess excellent charge transfer properties, making them suitable for electro-optical materials.

Purpose of the Study:

• To synthesize and characterize sophorolipid-porphyrin conjugates with systematically varied structures.
• To explore the self-assembly behavior of these novel bio-based molecules.
• To evaluate their potential for electro-optical applications.

Main Methods:

• Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) 'click' chemistry was employed for conjugation.
• Sophorolipids with varying acetylation and lipid unsaturation were synthesized.
• Zinc-porphyrin dyes were conjugated with varying numbers of SL arms (mono-, di-, tetra-).

Main Results:

• Successful synthesis of SL-porphyrin conjugates with controlled structural variations.
• UV-vis spectroscopy indicated the formation of supramolecular J-type aggregates in methanol/water.
• The conjugates exhibit diverse non-covalent interactions, including hydrogen bonding, π-π stacking, and hydrophobic interactions.

Conclusions:

• The synthesized SL-porphyrin conjugates represent a library of unique, bio-based molecules.
• Structural variations influence self-assembly into J-type aggregates.
• These materials hold promise for future development in functional electro-optical applications.