A Novel Uranyl Complex with Dimeric Lacunary Polyoxoanion: [(A-α-SiW9O33)2K{UO2(H2O)}2]11−

Clusters of Actinides with Oxide, Peroxide, or Hydroxide Bridges

“…Interest in these clusters derives from their potential applications in separation cycles, as well as the unique possibilities they provide for probing the role of 5f electrons in clusters. Several studies reported clusters containing a single actinide cation that bridges between two transition-metal polyoxometalate clusters or fragments. − Additional studies have examined transition-metal polyoxometalate clusters bridged through two − or three − actinide cations.…”

Recent advances in uranium-containing polyoxometalates

“…, Na 5 {K[UO 2 (H 2 O)] 2 (A-α-H 3 SiW 9 O 33 ) 2 }. 46 A {K[UO 2 (H 2 O)] 2 } cluster was captured by the open sites of half-open {Si 2 W 18 }, which was similar to Keggin-type dimeric structures. One year later, Kortz synthesized a novel horseshoe-shaped Dawson-type structure using K 16 Li 2 [H 6 P 4 W 24 O 94 ]·33H 2 O ({P 4 W 24 }), UO 2 (NO 3 ) 2 , and pH = 4 LiOAc/HOAc buffer (Fig.…”

“…1g-i). 40 Similar hexanuclear uranium clusters with different ratios of substitutional-disordered U IV /U VI were stabilized by the coordination of three or four {As III 46), which was built from Keggin-{SbW 9 } and the central {Na@ (UO 2 ) 6 (PO 3 OH) 6 } cluster (Fig. 1j).…”

Structural peculiarities of actinyl complexation with monolacunary polyoxometalates

“…The first structurally characterized polyoxometalate compounds of An(VI) with trilacunary anions, [M 2 (UO 2 ) 2 (α-PW 9 O 34 ) 2 ] 12-(M= Na, NH 4 , K), were described in paper [5] which stimulated increase of interest to structural chemistry of actinide polyoxometalates. Not only the crystal structures of numerous uranyl compounds with different isomers of di-and trivacant anions or condensed "giant" polyoxometalate polylacunary anions have been determined [6][7][8][9][10][11][12][13][14][15], but also Np(V) [16] and Np(VI) [17,18] complexes have been obtained. Progress in structural chemistry of actinide polyoxometalates has been summarized in the work [19].…”