Coordination chemistry of polyhydroxy acids: role of the hydroxy groups

Gajda, Tamás; Gyurcsik, Béla; Jakusch, Tamás; Burger, K.; Henry, Bernard; Delpuech, Jean‐Jacques

doi:10.1016/s0020-1693(97)06108-2

Cited by 44 publications

(41 citation statements)

References 32 publications

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“…The large downfield shift of H-1 is due to coordination of carboxylic group to the metal ion. Furthermore, the interaction of O-3 hydroxylic moiety is also suggested according to H-3 signal shift, as previously found in Cu(II)-GlNA system [9,31]. H-2 shows an upfield shift, that can be explained with the reduced positive charge density on nitrogen, induced by the dissociation of NH þ 3 group as a consequence of its interaction with Hg(II) ion.…”

Section: Nmr Datasupporting

confidence: 73%

Hg(II)-coordination by sugar-acids: Role of the hydroxy groups

Ferrari

Grandi

Lazzari

et al. 2005

Journal of Inorganic Biochemistry

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Section: Nmr Datasupporting

confidence: 73%

Hg(II)-coordination by sugar-acids: Role of the hydroxy groups

Ferrari

Grandi

Lazzari

et al. 2005

Journal of Inorganic Biochemistry

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“…The reasons for including protons in reactions (Eqs. (2) and (3)) are the hydrolysis of Th(IV), Eu(III) and Ca, and the observation that the co-ordination of polyhydroxy ligands with charged cations at alkaline pH is accompanied by deprotonation of the coordinating hydroxo groups [17][18][19][20][21][22]. The thermodynamic complexation constants (K and K Ca ) associated to Eqs.…”

Section: Resultsmentioning

confidence: 99%

Complexation of Th(IV) and Eu(III) by α-isosaccharinic acid under alkaline conditions

Vercammen¹,

Glaus²,

Loon³

2001

Radiochimica Acta

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The complexation of Th(IV) and Eu(III) by α-isosaccharinic acid (ISA) has been studied in the pH range from 10.7 to 13.3 by batch sorption experiments, and the influence of Ca on the complexation was investigated. Sixteen data sets -each determined at variable ISA concentrationsare used to determine the stoichiometry of the complexation reactions and the stability constants. Based on best-fit analysis of the sorption data, it is postulated that 1:1 Th:ISA complexes are formed in the absence of Ca according to the complexation reaction: Th + ISA (ThISA) −4H + 4H with log K = −10.1 at I = 0.3 M. In the presence of Ca, the sorption data can be interpreted best by a mixed-metal complex, according to the complexation reaction: Th + 2ISA + Ca (Th(ISA) 2 Ca) −4H + 4H with log K Ca = −3.6 at I = 0.3 M. There are no indications that Ca participates in complexes of ISA with Eu. The sorption data suggest that 1:1 Eu:ISA complexes are dominant in the pH range from 10.7 to 13.3 according to the complexation reaction: Eu + ISA (EuISA) −4H + 4H with log K = −30.6 at I = 0.3 M. It is important to note that the stoichiometric numbers and stability constants proposed here are not independent of the hydrolysis reactions of the two metal cations. Thus, the same hydrolysis data as used here have to be applied in speciation calculations with the ISA complexation data for Eu(III) and Th(IV).

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“…76 While many conflicting data have been reported, Gajda et al 154 offer the most complete and convincing study of the coordination chemistry of hydroxy acids and Cu(II). Using potentiometry, circular dichroism, EPR, and 13 C NMR, they characterized the Cu(II)-aldonate complexes formed over varying pH values and found that all aldonic acids studied formed analogous complexes under the same conditions.…”

Section: Other Transition Metal Ion Catalystsmentioning

confidence: 99%