The water-induced depolymerization and decrease in Tg have been observed in other glassy systems, including silicates, organic polymers, and sugars. To compare the extent of the decrease, we plot the reduced glass transition temperature (Tg * =TgTg WF , where Tg WF is the glass transition temperature of the water-free glass) as a function of water content in Figure . Results are shown for the present Co(hmba)3[CoBr4] glass well as various systems available from literature. Water addition has a pronounced effect on the Tg of the inorganic silicates and polymers, with a decrease in their Tg by ~50% when adding 10-14 wt% water. This contrasts the behavior of the majority of the sugars and polymers as well as the present Co(hmba)3[CoBr4] HCNG, which exhibit only a minor (~10-15%) reduction in Tg in the same water concentration range.