Abstract
The {Mo72Fe30} cluster is the basic unit of three crystalline materials rhombohedral [Mo72Fe30O252(CH3COO)12{Mo2O7(H2O)}2{H2Mo2O8(H2O)}(H2O)91]·150H2O (1), orthorhombic [H4Mo72Fe30O254(CH3COO)10{Mo2O7(H2O)}{H2Mo2O8(H2O)}3(H2O)87]·80H2O (2) and host guest system [HxPMo12O40 ⊂ H4MoVI72FeIII30(CH3COO)15-O254(H2O)98]·ca.60H2O (3). The {Mo72Fe30} Keplerate cluster in all the three crystalline compounds actively undergoes reversible redox cycles without any significant structural disintegration. Hydrogen peroxide/molecular oxygen and ascorbic acid/sodium dithionite are found to be suitable oxidizing and reducing agents, respectively. Compound 1 (reasonably soluble in water) shows reversible electron transfer reactions in a homogeneous aqueous medium, whereas, compounds 2 and 3 (having extended structures, thereby insoluble in water) undergo reversible electron transfer reactions in heterogeneous manner in solid-liquid interface reactions.
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