The choice of temperatures was aimed to provide thermodynamic data (ΔH, ΔS, and ΔG) at two standard temperatures as well as a third set at a reasonable high-temperature limit (100 °C) for the practical use of the condensation reaction, given the thermal stability of CUBE (decomposes above ~120 °C). All the produced data is available in the Supporting Information (Tables S1-S46 for thermodynamic data by reaction; Tables and for the electronic energy and thermal corrections by structure). This aimed to provide both precise thermodynamic data for the initial condensation reaction (the first substitution on the metal) and to get a sense of the level of precursor deactivation with subsequent condensation steps all the way to the completely condensed metallosilicate sites. Of course, this must be viewed as an approximation that reflects mainly the electronic effects on the central atom (metal)