Aggregation-induced emission (AIE) is one of the examples where molecular aggregation works constructively to endow the otherwise non-emissive molecule with highly fluorescent capability. During aggregation, aggregate size and structure changes are accordingly accompanied with the variations of optical properties. However, quantitative understanding of the optical properties of AIE aggregate can be complicated by the interplay of scattering, absorption, and fluorescence. Reported herein is the quantification of scattering, absorption cross-section spectra of the assembled 1,1,2,2-tetraphenylethene (TPE) with the newly developed Polarized Resonance Synchronous Spectroscopy. Presented herein is an experimental quantification of the scattering cross-section spectrum, absorption cross-section spectrum, extinction spectrum, and fluorescence depolarization spectra of TPE. On the other hand, study of its fluorescence properties including fluorescence depolarization during assembly can be complicated by the strong scattering as aggregation proceeds. Polarized Stokes’-shifted Fluorescence Spectroscopy was employed to extrapolate the analyte fluorescence depolarization. The new technique presented should have a broad application for investigating different kinds of molecular assembly and disassembly.

Quantitative understanding of aggregation-induced emission with polarized resonance synchronous spectroscopy and polarized stokes’-shifted fluorescence spectroscopy

2019 Spring National Meeting

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