1964
DOI: 10.1107/s0365110x64002936
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The crystal structure of hydrated potassium tetraperoxyditungstate(VI), K2W2O11.4H2O

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Cited by 56 publications
(20 citation statements)
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“…Two W atoms of distorted octahedral geometry are linked by the O atom with site symmetry 4/mmm, forming the linear W-O-W group. The W-O distance, 1.871 (1) A, is longer than the 1.819 A in NazWO4 (Okada, Morikawa, Marumo & Iwai, 1974) but shorter than the W-O(bridging) distance (1.93 A) in [W2OI~(H20)2] 2- (Einstein & Penfold, 1964). A similar lengthening of the metal-oxygen bond going from tetrahedral MO~-to octahedral oxygen-bridged compounds was found for Re complexes, viz.…”
supporting
confidence: 56%
“…Two W atoms of distorted octahedral geometry are linked by the O atom with site symmetry 4/mmm, forming the linear W-O-W group. The W-O distance, 1.871 (1) A, is longer than the 1.819 A in NazWO4 (Okada, Morikawa, Marumo & Iwai, 1974) but shorter than the W-O(bridging) distance (1.93 A) in [W2OI~(H20)2] 2- (Einstein & Penfold, 1964). A similar lengthening of the metal-oxygen bond going from tetrahedral MO~-to octahedral oxygen-bridged compounds was found for Re complexes, viz.…”
supporting
confidence: 56%
“…The dimeric moiety [M 2 O 2 (µ-O 2 ) 2 (O 2 ) 2 ] is a building block for these five anions. To the best of our knowledge, it has not been observed in peroxotungsten complexes with oxo, [15] oxalate [16] and carbonate [17] or in oxoperoxomolybdates [18,19] with molybdate as assembling ligands, [{MoO (O 2 6-. Complexes with [20] and without [20,21] w-, x = 1-4.…”
Section: Introductionmentioning
confidence: 88%
“…Transformation of K 2 [W 2 O 3 (O 2 ) 4 (H 2 O) 2 ]·2H 2 O (4) into 1: The dimeric peroxotungstate 4 (0.50 g, 0.7 mmol), prepared by the published method,23 was dissolved in 5 mL of water. Citric acid (0.34 g, 1.5 mmol) was added to this solution followed by a small amount of 30 % H 2 O 2 .…”
Section: Methodsmentioning
confidence: 99%
“…To better understand these catalytic processes, a more detailed characterization of peroxotungstates is necessary. It appears that [W(O 2 ) 4 ] 2– predominates at high pH (>7) and in the presence of excess H 2 O 2 ,22 whereas at intermediate pH (1.3–7.0) the dimer [W 2 O 3 (O 2 ) 4 (H 2 O) 2 ] 2– is the major species,23 and at lower pH the solution become unstable and lose oxygen 24. Although other peroxotungstates have also been observed in the solid state2527 and solution,28,29 the key to stabilizing peroxotungstates is to incorporate a ligand that can effectively coordinate to tungsten.…”
Section: Introductionmentioning
confidence: 99%
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