Aggregation process was historically of high interest in chemical physics of oligopyrrole dyes. To name a few areas, aggregation effects are significantly important for functioning of photosynthetic systems and for proper mimicking of sophisticated nature-made molecular mechanisms of electron transport. It was also found that dye aggregation is one of the most important factors negatively influencing singlet oxygen quantum yield of agents for cancer photodynamic therapy. Aggregation behavior control in literature, unluckily, still often kept in hard brackets of synthetic modification or stated as a byproduct of investigation, even though actual "control" term rather implies certain aggregation properties could be achieved by external stimuli. First investigations of aggregation structure-property relationships for BOD-IPY dyes were carried out by , they showed how different mesosubstitution motifs could lead to different aggregative consequences . More recent investigation of BODIPY dyes aggregation by Decalzo et al. expanded a range of structural considerations influencing aggregation patterns. For example, aliphatic substitution pattern directly influences possibilities of dense stacking, increase in size of conjugated system leads to increased aggregation tendency and to excimer formation, non-conjugated substituent alters type of formed aggregate, charge transfer induction also leads to different aggregation pathway and so on. Both groups utilized antisolvent systems and examined steady-state spectroscopic evidences.