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• W2000317273 abstract "Abstract The reaction of potassium tungstate with the biologically relevant ligands citric and tartaric acid, in the presence of hydrogen peroxide, was investigated to discover the effect of pH variation on the product pattern. The reaction with citric acid led to the formation of the dimer K 5 [WO(O 2 ) 2 (Hcit)H(Hcit)(O 2 ) 2 OW] · 6H 2 O ( 1 ; H 4 cit = citric acid) due to carboxyl‐carboxylic acid hydrogen bonding in the pH range 2–5; this complex can also be obtained by an exchange reaction between the oxo ligands of the dimeric hydrogencitrate tungstate K 4 [W 2 O 5 (Hcit) 2 ] · 4H 2 O ( 6 ) and H 2 O 2 . Interestingly, a novel dimeric peroxotungstate K 3 [W 2 O 3 (O 2 ) 4 (OH)] · H 2 O ( 2 ), without the coordination of citrate ligands, was isolated in the pH range 7–9, as confirmed by 17 O NMR solution studies. The reaction of potassium tungstate with ( R , R )‐tartaric acid afforded the tartratoperoxotungstate K 4 [W 2 O 2 (O 2 ) 4 {( R , R )‐tart}] · 3H 2 O [ 3 ; H 4 tart = ( R , R )‐tartaric acid] in the pH range 1–3. The dimeric peroxotungstate K 2 [W 2 O 3 (O 2 ) 4 (H 2 O) 2 ] · 2H 2 O ( 4 ) was found to react with citric or tartaric acid at pH 2–5 or 2–3, respectively, to give species 1 and 3 . Evidence that 1 exists as a dimer in solution is presented. The three complexes were characterized by elemental analysis, IR and NMR spectroscopy, and X‐ray structural analyses. The formation of these complexes is dictated by pH, and the thermal stabilities of 1 and 3 vary with the coordinated ligands. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)" @default.
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• W2000317273 date "2006-04-01" @default.
• W2000317273 modified "2023-10-12" @default.
• W2000317273 title "Peroxotungstates and Their Citrate and Tartrate Derivatives" @default.
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• W2000317273 doi "https://doi.org/10.1002/ejic.200501008" @default.
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