The Gold Sulfates MAu(S0<sub>4</sub>)<sub>2</sub> (M = Na, K, Rb)

Wickleder, Ma­thias S.; Büchner, Oliver

doi:10.1515/znb-2001-1215

Cited by 18 publications

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“…For the anhydrous sodium rare-earth metal oxosulfates NaRE[SO 4 ] 2 , their monoclinic crystal structure was solved in space group P2 1 /m for RE = Er [31] and Tm [32] and the triclinic one in space group P1 for RE = La [33] and Nd [31]. For trivalent gold instead of RE 3+ cations, the monoclinic crystal structure of NaAu[SO 4 ] 2 was described in space group P2 1 /n [34], but Au 3+ in square planar oxygen coordination causes marked topological differences. Not so different from the Na + analogs, for triclinic AgEu[SO 4 ] 2 (space group: P1) with Ag + in eightfold oxygen coordination, its Eu 3+ bulk luminescence was also measured very recently [35].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis, Crystal Structure, and Spectroscopic Properties of Pure and Eu3+-Doped NaY[SO4]2 ∙ H2O and Its Anhydrate NaY[SO4]2

et al. 2021

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The water-soluble colorless compound NaY[SO4]2 ∙ H2O was synthesized with wet methods in a Teflon autoclave by adding a mixture of Na2[SO4] and Y2[SO4]3 ∙ 8 H2O to a small amount of water and heating it up to 190 °C. By slow cooling, single crystals could be obtained and the trigonal crystal structure of NaY[SO4]2 ∙ H2O was refined based on X-ray diffraction data in space group P3221 (a = 682.24(5) pm, c = 1270.65(9) pm, Z = 3). After its thermal decomposition starting at 180 °C, the anhydrate NaY[SO4]2 can be obtained with a monoclinic crystal structure refined from powder X-ray diffraction data in space group P21/m (a = 467.697(5) pm, b = 686.380(6) pm, c = 956.597(9) pm, β = 96.8079(5), Z = 2). Both compounds display unique Y3+-cation sites with eightfold oxygen coordination (d(Y–Os = 220–277 pm)) from tetrahedral [SO4]2− anions (d(S–O = 141–151 pm)) and a ninth oxygen ligand from an H2O molecule (d(Y–Ow = 238 pm) in the hydrate case. In both compounds, the Na+ cations are atoms (d(Na–Os = 224–290 pm) from six independent [SO4]2− tetrahedra each. Thermogravimetry and temperature-dependent PXRD experiments were performed as well as IR and Raman spectroscopic studies. Eu3+-doped samples were investigated for their photoluminescence properties in both cases. The quantum yield of the red luminescence for the anhydrate NaY[SO4]2:Eu3+ was found to be almost 20 times higher than the one of the hydrate NaY[SO4]2 ∙ H2O:Eu3+. The anhydrate NaY[SO4]2:Eu3+ exhibits a decay time of about τ1/e = 2.3 µm almost independent of the temperature between 100 and 500 K, while the CIE1931 color coordinates at x = 0.65 and y = 0.35 are very temperature-consistent too. Due to these findings, the anhydrate is suitable as a red emitter in lighting for emissive displays.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis, Crystal Structure, and Spectroscopic Properties of Pure and Eu3+-Doped NaY[SO4]2 ∙ H2O and Its Anhydrate NaY[SO4]2

et al. 2021

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“…RbAu(SeO 4 ) 2 crystallizes monoclinically with the space group C2/m and is not isotypic with one of the respective sulfates known so far [7,8]. However, the main structural feature of RbAu(SeO 4 ) 2 , [AuO 4 ] units linked by tetrahedral anions to infinite chains 1 ϱ [Au-(SeO 4 ) 4/2 ] Ϫ , is almost the same as found for MAu(SO 4 ) 2 (M ϭ Na-Rb) (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately the latter have not been characterized structurally. We recently showed that in the structure of the respective ternary sulfates MAu(SO 4 ) 2 (M ϭ Na-Rb) square planar [AuO 4 ] units are linked to chains according 1 ϱ [Au(SO 4 ) 4/2 ] Ϫ while for CsAu(SO 4 ) 2 a connection of these units to layers was observed [7,8]. We now started to investigate also the selenates structurally and we here present the crystal structure of the first ternary gold selenate which is surprisingly not isotypic with one of the sulfates.…”

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confidence: 99%

RbAu(SeO₄)₂: First Structure Determination of a Ternary Gold Selenate

Büchner

Wickleder

2004

Zeitschrift anorg allge chemie

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Yellow single crystals of RbAu(SeO 4 ) 2 were obtained upon evaporation of a solution prepared from the reaction of elemental gold and Rb 2 CO 3 with conc. selenic acid. In the crystal structure (monoclinic, C2/m, Z ϭ 2, a ϭ 1078.7(4), b ϭ 522.7(1), c ϭ 739.3(2) pm, β ϭ 116.45(2)°) Au 3ϩ is in square planar coordination of oxygen atoms which belong to four SeO 4 2Ϫ ions. Accord-The oxidation of elemental gold with concentrated selenic acid is well known for a long time [1]. Formerly, Au 2 (SeO 4 ) 3 was assumed to be the reaction product and this substance has been shown to be useful in glass coloring processes [2,3]. However, roughly twenty years ago it has been shown that in fact selenites form during the dissolution of elemental gold in selenic acid which have, depending on the specific conditions, the different compositions Au 2 (SeO 3 ) 2 O and Au 2 (SeO 3 ) 2 (Se 2 O 5 ) [4]. Recently we were able to prepare and to characterize the non-centrosymmetric selenite-selenate Au 2 (SeO 3 ) 2 -(SeO 4 ) which was the first selenate of gold, although it contains SeO 3 2Ϫ ions additionally [5]. The first reliable report on ternary gold selenates was given by Donova and Š iftar [6], who prepared compounds of the composition MAu(SeO 4 ) 2 (M ϭ H, K-Cs). Unfortunately the latter have not been characterized structurally. We recently showed that in the structure of the respective ternary sulfates MAu(SO 4 ) 2 (M ϭ Na-Rb) square planar [AuO 4 ] units are linked to chains according 1 ϱ [Au(SO 4 ) 4/2 ] Ϫ while for CsAu(SO 4 ) 2 a connection of these units to layers was observed [7,8]. We now started to investigate also the selenates structurally and we here present the crystal structure of the first ternary gold selenate which is surprisingly not isotypic with one of the sulfates.

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