Meanwhile, the crystalline 1-R and 1-S displayed no signs of any phase transitions or large structural changes observed by VT SCXRD and DSC analyses in the studied temperature range. Additionally, unlike our previous work, we do not observe noticeable emission thermochromism that usually indicates a change in the emission mechanism/band. The emission and CPL intensity at both major peaks of 466 and 496 nm are rising simultaneously upon cooling, while there is almost no change in the emission lifetime between 85K and 293K remains in the range of few hundreds μs (~140/180 µs at 85K vs ~150/175 µs at 293K for 466/496 nm peaks), which can be attributed only to phosphorescence. Thus, we can assume that the thermally induced changes in glum cannot be associated neither with phase transition nor with change in the emission mechanism, and should have another origin.