The number of variables in the analyzed systems, in particular the presence of the two different substituents at various positions, which effect is not simply additive, makes the generalization of observed tendencies not straightforward. Yet, the triplets of the dyes, differing with one substituent only can be directly compared. Hence, for compounds carrying electron OMe group in the benzothiazole ring (1-3) fluorescence is enhanced upon aggregation. For compounds within sub-groups 4-6 and 7-9 the AIE is observed for strong electron acceptor at R ′ , slight increase or decrease of emission (absence of substituent), and finally ACQ in the presence of electron donor OMe attached to phenyl (Fig. and.) The FQY data suggests that for aggregates of sub-group 1-3, the excited state potential energy surface is high above the ground state and, most probably, the conical intersection is energetically separated from Franck-Condon excited state, thus limiting a non-radiative decay probability and causing emission enhancement (compare ). The similar conclusion can be drawn for the remaining -C6H4CF3 dyes (6 and 9). The emission wavelength (Tab. 1) for the molecule depends on the nearest surrounding of the dye. In the series 1-3 (R=OMe), upon aggregation the bathochromic shift is visible for the first compound, no change in the emission for 2, and hypsochromic shift for 3. Within the sub-series 4-6 (R=H), for compounds 5 and 6 (R ′ =H and CF3), the red-shift is very small and amounts to 5.5 and 2.5 nm, respectively. On the other hand, for 7-9 compounds with R ′ =H or CF3, the emission red-shift upon aggregation is much smaller than that for 7, but this is not surprising as 7 is extreme molecule (vide infra). Thus, for 4 and 7 (R ′ =OMe, two ACQ dyes) an exceptional red-shift of emission is observed (57.5 and 95 nm, respectively) for an aggregate (λ em agg ) with respect to the THF solution (λ em THF ). This may be interpreted, in part, as the result of energygap rule telling that lowering energy between excited and ground states (corresponding to batochromic shift of emission) causes higher probability of non-radiative transitions (FQY decrease). From the supramolecular point of view the origin of such reduction in FQY may lay in both the dye-dye interactions and interaction of dye aggregates with water molecules, however the comparison of the aggregate with crystal data suggest the domination of the latter effect (Tab. S1).