Specifically, 50(Na2O)-50(P2O5) inorganic glass was chosen for its greater durability and stability in air compared to other sodium phosphate-based glasses (Fig. ). These phosphate glasses are composed by PO4 tetrahedral units and described using the Q n designation (where n denotes the number of bridging oxygens on a given phosphate tetrahedral units). ZIF-8, Zn(mIm)2 (mIm = 2-methylimidazolate, C4H4N2 -) was selected as it is the 'prototypical' crystalline ZIF, whose properties and structure have been extensively studied (Fig. ) and which is available commercially under the name Basolite® Z1200.