Supramolecular self-association of small π-conjugated organic molecules leads to well-defined nanoarchitectures like vesicles, micelles, low molecular weight gels, and other noncovalent aggregates.1-3 In this context, molecular aggregates with size and morphology-dependent tunable emission capture the significant attention.3 However, the correlation between the shape and size (solid-state characterization) and the emission behaviour (dispersion-state analysis) of the aggregates is often rudimentary and can be benefitted through further analysis. In the present study, we demonstrated the detailed insight of the nanofiber evolution from true solution of a thiophene-based acceptor-π-donor-π-acceptor molecule (TPAn) through the steady-state absorption, emission, electron microscopy, and fluorescence correlation spectroscopy (FCS) analyses. The FESEM images showed the formation of the connected network of nanofibers for the dispersion having water content 80%. However, the formation of smaller-sized nanofibers in the dispersion was realized from FCS results (Fig. 1).4 Such smaller nanofibers can be transformed into the connected network of nanofibers through agglomeration during the solvent evaporation in the course of sample preparation for the electron microscopy.4 Besides, the self-assembly of TPAn was explored in the complex and heterogeneous medium, like HeLa cells, revealing the contrasting optical responses in lipid droplets compared to that in the bulk solution and molecular aggregates. Hence, we believe the present study will provide a general experimental protocol to establish the relation between the morphological evolution and emission behaviour for all-organic fluorescent nanoaggregates.

Deciphering the evolution of supramolecular nanofibers in solution and solid-state: a combined microscopic and spectroscopic approach

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27th CRSI National Symposium in Chemistry

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