[Na4(H2O)7][Fe(OH)6Mo6O18]: a new [12] metallacrown-6 structure with an octahedrally coordinated iro

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The reaction of an aqueous solution of sodium molybdate with ironpowder at low pH (~0.184) gives rise to the formation of a six-member Mo ring-shape cluster with an Fe (Ⅱ) encapsulated at the center, [Na4(H2O)7][Fe(OH)6Mo6O18](1), which is further linked to a remarkable three-dimensional network via sodium ions
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