Structural peculiarities of actinyl complexation with monolacunary polyoxometalates

Uranium(VI) complex with silicoundecatungstate, K7H6[K(UO2)(H2O)(α-SiW11O39)2]·21H2O, has been obtained and its structure has been determined using X-ray single crystal diffractometry and confirmed by electron and IR absorption spectroscopy. The stability of An(VI) complexes with monolacunary heteropolyanions in solution is discussed from the structural point of view.