Interestingly, the water-containing Co(hmba) 3[CoBr4] HCNGs also appear to feature a more converged Tg (i.e., Tg is constant upon increasing water content) compared to other organic and inorganic systems upon water addition. This is likely because water significantly outnumbers the number of bridging Co atoms at a relatively low water concentration (~5-10 wt%), creating a glassy system controlled by weaker cohesive forces and hydrogen bonds. In contrast, the anhydrous system consists of the highly crosslinked (yet rather weak) Co-hmba network.