A new structural family of heteropolytungstate lacunary complexes with the uranyl, UO22+, cation

Polyoxo Anions: Synthesis and Structure

“…453 A similar type of tetrahedral assembly has recently been reported for [(UO 2 ) 12 (m 3 -O) 4 (m 2 -H 2 O) 12 (P 2 W 15 O 56 ) 4 ] 32À by Gaunt et al454 …”

Electrospray ionization mass spectrometry of a cerium(III) phosphomolybdate complex: Condensed and gas-phase cluster chemistry

“…(4a)) and present as presumably an oxo-saturated ion in solution (see Section 3.6), is a new moiety to phosphomolybdate chemistry; isolation of Ce(III)PMo 10 [19,[21][22][23][24]. Condensed phase results do not support the first hypothetical structure for the cerium complexes as crystal structures suggest that the vacancy in the trivacant lacunary Keggin ion is too large to complex a Ln ion; however it does effectively coordinate the actinyl cation (AnO 2 2+ ) through equatorial binding sites due to the steric hindrance imposed by these species [25][26][27]. Also, only plenary Keggin ions have been shown to complex tetravalent transition metals, i.e., Zr and Hf [18] (h = 1-3; Fig.…”

Isolation of an Asymmetric Lanthanide Polyoxometalate, Na12H[(W5O18)Tb(H2W11O39)]·42H2O, Containing Two Distinct Isopolyanions

“…Complexes formed by such coordination have been shown to be very efficient catalysts for the oxidation of organic compounds [2][3][4], or have excellent optical properties in the case of the lanthanides [18][19][20][21][22]. In addition, the complexes formed with actinide cations are relevant for studies of radioactive waste treatment [15].…”

“…; n = 4, 4, 3, and 3, respectively). Lacunary polyanions are generally difficult to isolate on their own, but are effective ligands for transition metal [1][2][3][4], lanthanide [5][6][7][8][9][10][11][12][13][14], and actinide cations [15][16][17]. Complexes formed by such coordination have been shown to be very efficient catalysts for the oxidation of organic compounds [2][3][4], or have excellent optical properties in the case of the lanthanides [18][19][20][21][22].…”