DLS revealed a rather narrow size distribution and concentration dependent average size of the aggregates between 300 nm at lower concentrations and reaching up to 1 µm at higher concentrations (see Supporting Information Figure ). Comparison with the corresponding UV/vis spectra showed a direct positive correlation between increasing size of the aggregates and more pronounced fine structure of the redshifted absorptions (see Supporting Information Figure ). A corresponding filtering experiment using filter pore sizes of 450 nm confirmed the DLS reported sizes and did indeed lead to full removal of aggregates formed from a 3.70 • 10 -6 mol/L concentrated benzene solution (see Supporting Information Figure ). Another correlation was found when monitoring the aggregation of a 5.18 • 10 -6 M PAT 1 solution over time, where longer incubation periods led to increasing sizes of the aggregates plateauing out at 700 nm average size after 30 min (Figure ). However, these samples ultimately showed clear precipitation after prolonged storage times of hours to days and thus the aggregation is certainly continuing on the long term.