Serial dilutions of CuSO4, made as part of an AP chemistry lab experiment. The simple beauty of a colorful solution can make a mundane lesson interesting and plant the seed of a lifelong interest in science.
Subliming 4-amino-4H-1,2,4-triazole. It is quite interesting that a molecule with that much nitrogen in it does not decompose at even 160 °C, it only sublimes a bit. Sublimation is the transition of a substance directly from the solid to the gas phase without passing through an intermediate liquid phase.
Illustrated above is a highly symmetric (point symmetry of D2h) all-boron fullerene-like structure. B38 is composed of 56 triangles and 4 hexagons, with the latter being “crucial to the stabilization of the structure.”
Interestingly, the structure includes “50 σ- and 32 π- delocalized to form multi-center bonds… apparently [satisfying] the 2(N+1)2 rule of spherical aromaticity, with N=4 and 3, respectively” (more on aromaticity here). The high double aromaticity (σ- and π-) in combination with a large (HOMO-LUMO) energy gap (~2.25 eV) contribute to the structure’s unexpected chemical stability.
Lv, J.; Wang, Y.; Zhu, L.; Ma, Y. B38: an all-boron fullerene analogue. Nanoscale. 2014 / DOI: 10.1039/C4NR01846J