New Crown-Shaped Polyoxovanadium(V) Cluster Cation with a μ<sub>6</sub>-Sulfato Anion and Zwitterionic μ-(β-Alanine): Crystal Structure of [V<sub>6</sub>O<sub>12</sub>(OH)<sub>3</sub>(O<sub>2</sub>CCH<sub>2</sub>CH<sub>2</sub>NH<sub>3</sub>)<sub>3</sub>(SO<sub>4</sub>)][Na][SO<sub>4</sub>]·13H<sub>2</sub>O
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Treatment of vanadium(V) oxide with an ethanol-concentrated sulfuric acid mixture, followed by the addition of an equimolar amount of β-alanine and sodium hydroxide, and finally raising the pH to 3.9 with sodium carbonate solution, under continuous heating in a water bath and in the presence of air, leads to the polyionic sodium cyclo-{μ6-(sulfato-O,O‘,O‘ ‘)tris[μ-(β-alanine-O,O‘)-μ-oxo]tris(μ-hydroxo-μ-oxo)hexa[oxovanadium(V)]} sulfate tridecahydrate which crystallizes in the monoclinic P21/n space group [a = 9.5192(4), b = 20.1185(9), c = 22.6174(9) Å, β = 97.011(1)°; Z = 4]. The crown-shaped polyoxovanadium(V) cluster cation, with carboxylate-bridging amino acid ligands, has an Anderson structure with two unique capping sulfato ligands. Its structural analysis, together with IR, UV−vis, and preliminary data on its solution properties, is presented.
