Complexes of praseodymium(III) with d-gluconic acid

Complexation of Uranium(VI) by Gluconate in Acidic Solutions: a Thermodynamic Study with Structural Analysis

“…The data were collected using the echo-antiecho pulsed field gradient coherence selection with 128x2 t 1 increments collected with 128 scans accumulated for each increment. The relaxation delay was 1s and no BIRD or TANGO scheme was used to suppress protons bound to 12 C. All delays within the pulse sequence were kept short to minimize T 2 relaxation losses. Acquisition times were 170 ms in t 2 and 22 ms in t 1 and 13 C decoupling was achieved during the acquisition with GARP decoupling.…”

“…Gluconate was added in large quantities to the nuclear materials processed at Hanford to facilitate dissolution of iron and aluminum [1][2][3][4][5][6][7][8][9] , and consequently, it directly affects f-element speciation in HLW. [10][11][12][13] This complicates waste processing for vitrification. Despite its use in industrial-scale nuclear materials processing, molecular-level information on the interactions of gluconate and actinide cations has not yet been reported.…”

Lactonization and Protonation of Gluconic Acid: A Thermodynamic and Kinetic Study by Potentiometry, NMR and ESI-MS

“…(1,2) Many studies deal with solutions of high pH because gluconate forms strong complexes with metal cations in neutral to basic solutions. (3)(4)(5)(6)(7) Fewer studies have been conducted in solutions of low pH, and thermodynamic data that describe solution behavior under acidic conditions are scarce and in disagreement. Two reasons likely contribute to this situation: 1) Under acidic conditions, the ability of gluconic acid to bind metal ions is weak or moderate, (8,9) making the studies less attractive for applications; 2) the studies at low pH are complicated by lactonization of gluconic acid, (10,11) a slow reaction that is coupled to fast chemical processes such as protonation/deprotonation and complexation.…”

Amphiphilic Amide Derivatives of D‐Glucaric Acid. Synthesis and Complexing Properties Toward Lanthanide(III) Ions

“…Table 2 for a metal-to-ligand ratio of 1 :5 In the acidic range of pH values, the predominant complex is ML 2 . In a previous study, [13] the formation of the complex ML of gulonic acid, in addition to ML 2 , was also detected, but this complex would be present in noticeable quantities only at low ligand-to-metal ratios. Under the conditions of our present experiments, it was not possible to detect the formation of this complex, probably because, if it exists, its proportion is low in the presence of the ML 2 species.…”

“…The complexation of Pr III , Eu III , Dy III and Lu III ions was studied individually with both the propylamide and gulonic acid. We have reported previously [13] a study of the Pr 3ϩ / gluconic acid system in which the complexes formed in aqueous solutions were examined extensively and carefully as a function of pH. [10] This previous study helped us to investigate the Ln 3ϩ /gulonic acid and propylglucaramide systems.…”