To test the state of the trapped water in the structures, we have investigated the water evaporation from the dry and hydrated glasses (i.e., containing 0, 7, and 14 wt% water, equivalent to 0, 4.6, and 9.2 H2O per bridging Co, respectively). These experiments were done in open crucibles by thermogravimetric analysis (Figure ), while we note that the initial water incorporation was done in sealed crucibles. We find that nearly all the added water is released upon heating and that evaporation is initiated already at ~50 °C (upon contact with a dry He atmosphere). The sample with 14 wt% water exhibits a faster water release at lower temperatures compared with the 7 wt% water sample. This suggests weaker bonding of water at higher water concentrations. That is, some water may be weakly bonded in the depolymerized hybrid coordination structure and not interacting with the coordinating Co-octahedra, in agreement with the stabilization of the Tg and Tm values at high water contents (Figure ).