First, for the synthesis of Sr5(MnO4)3OH at q(H2OK,Sr) = (2.8,4), 210 mmol of KOH, 10.2 mL of ultrapure water, 4 mmol of Sr(OH)2 and 1 mmol of KMnO4 were added to a 23 mL Teflon container. It was inserted into an autoclave, which were then placed in an oven and heated at 230 ºC for 12 h with a 5 ºC min -1 ramp. It was then cooled down to room temperature. Powders were finally collected after water washing and centrifugation cycles, followed by heating under vacuum overnight at 40 ºC. During all synthesis batches, the Mn:A(K,Na) molar ratio was maintained equal 1:210. Therefore, the adjust of q(H2OA) and q(Sr) parameters was done by varying the water and strontium amounts added, respectively. For introducing the q(Cl), KOH was replaced by KCl in hydrofluxes compositions. It is important to notice that manganese sources in potassium hydroxide (KOH) and sodium hydroxide (NaOH) hydroflux were potassium permanganate (KMnO4) and sodium permanganate monohydrate (NaMnO4•H2O), respectively. In addition, the hydration water present in the reagents was always considered as part of the total amount of water added. Neutral density filters, aperture size, and integration time were chosen to maximize the signal-tonoise ratio. A 600 mm -1 grating alongside a Syncerity TE-cooled FI-UV-vis detector to analyze the collected light.