“…Substituted polyanions (general formula [XM 11 M (H 2 O)O 39 ] p− ) may be obtained by changing at least one of the addenda ions by another metal ion, M , which can be also electroactive, enlarging the scope of electrocatalytic applications [1,2,10]. In the present work the studied anions were the lacunary ␣-[SiW 11 The production of new devices for specific applications, e.g., catalysis, electro-optical and chemical sensing has been, in the past years, an enthusiastic and rapidly growing area.…”