Figure 9
(a) Pore structure of Sc2BDC3 with Groups 1 and 2 coloured green and blue, respectively. Site 1 and Site 2 methanol molecules are coloured purple and yellow respectively. Sc2(NO2-BDC)3 at (b) ambient pressure and (c) 0.8 GPa on direct compression. Note, the ScO6 octahedra tilt by approximately 25° on undergoing the transition, causing the collapse of the one-dimensional porous network. Colour scheme for (b) and (c): O, red; C, grey; N, blue and ScO6 octahedra, green. H atoms have been removed for clarity. (d) Optical image of Sc2BDC3 (lower crystal) loaded in Fluorinert FC-77 at 0.40 GPa (left) and 0.10 GPa (right) after decompression. The colourless crystal sitting above Sc2BDC3 is a chip of ruby, which is used as a pressure calibrant. Figure adapted from Graham et al. (2014). |