An Alkali Metal−Crown Ether Complex Supported by a Keggin Anion through the Three Terminal Oxygen Atoms in a Single M₃O₁₃ Triplet:  Synthesis and Characterization of [{Na(dibenzo-18-crown-6)(MeCN)}₃{PMo₁₂O₄₀}]

An alkali metal complex supported by a Keggin unit, [{Na(dibenzo-18-crown-6)(MeCN)}3{PMo12O40}]], is synthesized and characterized by elemental analysis, IR and 1H NMR spectra, and X-ray crystallography, showing that the α-Keggin [PMo12O40]3- anion is coordinated to three [Na(dibenzo-18-crown-6)(MeCN)]+ units by using the three terminal oxygen atoms in a single M3O13 triplet.