Xi:Irritant;14311-52-5Relevant articles and documents
Novel octatungstate-supported tricarbonyl metal derivatives: {[H 2W8O30][M(CO)3]2} 8- (M = MnI and ReI)
Niu, Jingyang,Yang, Linping,Zhao, Junwei,Ma, Pengtao,Wang, Jingping
, p. 8298 - 8300 (2011)
Three novel octatungstate-supported tricarbonyl metal derivatives have been synthesized and characterized, which represent the first examples of isopolyoxotungstates-supported carbonyl metal compounds. The Royal Society of Chemistry 2011.
Chemical behavior of tungstate solutions. Part 1. A spectroscopic survey of the species involved
Barre, Thierry,Arurault, Laurent,Sauvage, Francois X.
, p. 551 - 557 (2005)
This study is focused on the composition and the evolution of tungstate ions solutions as a function of pH and increasing concentrations. The Raman analysis showed that, during the titration of the tungstate solutions, WO 42-, HWO4- ions and probably W 2O72-, HW2O72- and H2W2O7 solvated species could exist in aqueous solutions. For diluted solutions, additions of a strong acid does not cause any precipitation, whereas the formation of the unstable solid tungstic acid (H2WO4 or WO3·H2O) could occur in concentrated solutions.
Aqueous speciation studies of europium(III) phosphotungstate
Zhang, Cheng,Howell, Robertha C.,Scotland, Kymora B.,Perez, Frances G.,Todaro, Louis,Francesconi, Lynn C.
, p. 7691 - 7701 (2008/10/09)
The incorporation of lanthanide ions into polyoxometalates may be a unique approach to generate new luminescent, magnetic, and catalytic functional materials. To realize these new applications of lanthanide polyoxometalates, it is imperative to understand the solution speciation chemistry and its impact on solid-state materials. In this study we find that the aqueous speciation of europium(III) and the trivacant polyoxometalate, PW9O 349-, is a function of pH, countercation, and stoichiometry. For example, at low pH, the lacunary (PW11O 39)7- predominates and the 1:1 Eu(PW11O 39)4-, 2, forms. As the pH is increased, the 1:2 complex, Eu(PW11O39)211- species, 3, and (NH4)22{(Eu2PW10O38) 4(W3O8(H2O)2(OH) 4}·44H2O, a Eu8 hydroxo/oxo cluster, 1, form. Countercations modulate this effect; large countercations, such as K + and Cs+, promote the formation of species 3 and 1. Addition of Al(III) as a counterion results in low pH and formation of {Eu(H2O)3(α-2-P2W17O 61)}2, 4, with Al(III) counterions bound to terminal W-O bonds. The four species observed in these speciation studies have been isolated, crystallized, and characterized by X-ray crystallography, solution multinuclear NMR spectroscopy, and other appropriate techniques. These species are 1, (NH4)22{(Eu2PW10O38) 4(W3O8(H2O)2(OH) 4}·44H2O (P1; a = 20.2000(0), b = 22.6951-(6), c = 25.3200(7) A; α = 65.6760(10), β = 88.5240(10), γ = 86.0369(10)°; V = 10550.0(5) A3; Z = 2), 2, Al(H 3O){Eu(H2O)2PW11O 34}·20H2O (P1, a = 11.4280(23), b = 11.5930(23), c = 19.754(4) A; α = 103.66(3), β = 95.29(3), γ = 102.31(3)°; V = 2456.4(9) A3; Z = 2), 3, Cs 11Eu(PW11O34)2·28H 2O (P1; a = 12.8663(14), b = 19.8235(22), c = 21.7060(23) A; α = 114.57(0), β = 91.86(0), γ = 102.91(0)°; V = 4858.3(9) A3; Z = 2), 4, Al2(H3O) 8{Eu(H2O)3(α-2-P2W 17O61)}2·29H2O (P1; a = 12.649(6), b = 16.230(8), c = 21.518(9) A; α = 11.1.223(16), β = 94.182(18), γ = 107.581(17)°; V = 3842(3) A;3; Z = 1).
Kinetics of the Base Decomposition of Dodecatungstophosphate(3-) in Weakly Alkaline Solutions
Kyle, James H.
, p. 2609 - 2612 (2007/10/02)
The kinetics of the decomposition of 3- (1.5 x 10-5 mol dm-3) to 2- and 3- has been studied in the range pH 7-9 at an ionic strength of 0.1 mol dm-3.The reaction proceeds
