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]]
Inorg Chem. 2001 Oct 8;40(21):5468-71.
doi: 10.1021/ic0012874.