Chromophore molecular aggregates often display aberrant photophysical properties relative to their constiuent monomer units. In some cases, changes in absorption, emission, energy transfer and chemical reactivity are induced by transition dipole moment coupling, which creates long-rane delocalized Frenkel excitons. In this talk, I will discuss our work on two-dimensional and nanotubular excitonic aggregates derived from cyanine dyes. We will show that these topologies afford unique handles with which we can tune the photophysics through chemically controlled aggregation. We will demonstrate a revised taxonomy to describe 2D aggregates beyond the redshifted J, and blueshifted H paradigm. Combining principles from supramolecular assembly and detailed spectroscopy we will show that long-range coherent dipoles can be designed into novel systems, and thus we can tune collective photophysics, including efficient exciton transport and superradiant emission.

Designed molecular aggregates with controllable long-range coherence

ACS Fall 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.