Lanthanide complexes of amino acids

Prados, Ronald A.; Stadtherr, Leon G.; Donato, Henry; Martin, R. Bruce

doi:10.1016/0022-1902(74)80135-1

Cited by 85 publications

(29 citation statements)

References 10 publications

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“…This ionization could have a significant effect on the Tb(III) emission quantum yield by altering the number of water ligands in the primary hydration sphere of the glycinecomplexed Tb(III) (15,28). Above pH 7.5, measurements were prevented by reactant precipitation, probably as a result ofTb(III) hydrolysis (26). Although the multiplicity ofTb(III)-binding sites in the wheat plasma membranes precludes detailed analysis, the apparent pKa of about 6 for the pH dependence of the Tb(III) phosphorescence (Fig.…”

Section: Preliminary Experimentsmentioning

confidence: 99%

Analysis of Aluminum and Divalent Cation Binding to Wheat Root Plasma Membrane Proteins Using Terbium Phosphorescence

Caldwell¹

1989

Plant Physiol.

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A phosphorescent trivalent cation, terbium [Tb(lII) (lIl) with higher affinity than the more tolerant cultivar (BH 1146). At pH 5.5 where AI(lll) did not displace bound Tb(lll), low levels of AI(lIl) reduced the ability of Mn(ll) to decrease Tb(lIl) phosphorescence. The significance of these results is discussed with respect to the mechanisms of AI(lIl) tolerance in wheat and the potential beneficial effects of AI(lll) in reducing Mn(ll) phytotoxicity.

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Section: Preliminary Experimentsmentioning

confidence: 99%

Analysis of Aluminum and Divalent Cation Binding to Wheat Root Plasma Membrane Proteins Using Terbium Phosphorescence

Caldwell¹

1989

Plant Physiol.

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“…Early results from cd (circular dichroism) studies suggested involvement of the amino group (6); however, this was questioned by later workers (7). Proton and 13c chemical shift changes induced by lanthanide ions suggested that for the alanine complexes of light lanthanides coordination was via only one oxygen, but for heavier lanthanides via two (8).…”

Section: Introductionmentioning

confidence: 99%

“…Leigh also derived an approximate solution (eq. [7]) assuming no contribution of the outer sphere relaxation, dilute solution of the paramagnetic spins, and that the shift caused by the complexation is much less then the reciprocal of the lifetime of…”

Section: Introductionmentioning

confidence: 99%

“…Equation [7] can be further simplified, because Tic >> r b , SO the effect of the lifetime of the coordinated ligand can be neglected, and because Nf = NL (the total amount of ligands in solution). Rearrangement of the equation then gives where q is the average coordination number of the metal ion (i.e., Nb = NM X q) and p is the molar ratio of the metal ion to ligand in the solution (i.e., p = NM/NL).…”

Section: Introductionmentioning

confidence: 99%

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A proton nuclear magnetic resonance relaxation study of the glycine, alanine, and lactate complexes of gadolinium(III) in aqueous solution

Reid¹,

Podányi²

1987

Can. J. Chem.

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, 1508 (1987). The 'H nuclear magnetic resonance spin-lattice and spin-spin relaxation rate enhancements induced by the gadolinium(II1) ion were measured in solutions of glycine, alanine, and sodium lactate containing different amounts of Gd(II1). The proton relaxation rates in the Gd(II1) complexes were calculated from these data, and were used to calculate metal-hydrogen atom distances.Comparison of these data with corresponding distances calculated from literature X-ray crystallographic data for model compounds shows that in the two amino acid complexes the Gd(II1) ion is coordinated in a four-membered ring through the two oxygen atoms of the carboxyl,ate group. By contrast, in the lactate complex coordination is via a five-membered ring involving one oxygen atom of the carboxylate group and the a-hydroxyl oxygen.

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“…There is strong evidence that the bonding between Ln 3+ ions and amino acids is made with the oxygens of the carboxylate group, and that the bonding via the nitrogen of the amino group is unlikely to occur at least in a range of pH values up to 5.6 3,4 . In this paper we examine the relation between the basicity of the carboxylate groups of glycine (Gly), L-aspartic acid (Asp), L-glutamic acid (Glu), L-histidine (His), DL-malic acid (Mal) and Aspartame TM (APM) ( Table 1), and the intensity parameters of 4f-4f transitions in their compounds with Nd 3+ ion.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Study of the Interaction of Nd3+ with Amino Acids: Phenomenological 4f-4f Intensity Parameters

Jericó¹,

Carubelli²,

Massabni³

et al. 1998

J. Braz. Chem. Soc.

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Estudamos o comportamento dos parâmetros fenomenológicos de intensidade das transições 4f-4f em compostos de Nd 3+ com glicina, ácido L-aspártico, ácido L-glutâmico, L-histidina, ácido DL-málico e Aspartame® em solução aquosa como função dos valores de pK e das cargas parciais sobre os átomos de oxigênio dos grupos carboxilatos dessas moléculas. Os resultados são discutidos e interpretados qualitativamente em termos dos mecanismos das intensidades 4f-4f por dipolo elétrico forçado e acoplamento dinâmico, indicando como dominante o mecanismo de dipolo elétrico forçado.We have studied the bevahior of the phenomenological 4f-4f intensity parameters in compounds of the Nd 3+ ion with glycine, L-aspartic acid, L-glutamic acid, L-histidine, DL-malic acid and Aspartame TM in aqueous solution, as a function of the pK values and partial charges on the oxygens of the carboxylate groups of these molecules. The results are discussed and qualitatively interpreted in terms of the forced electric dipole and dynamic coupling mechanisms of the 4f-4f intensities, thus indicating that the forced electric dipole mechanism is dominant.

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Lanthanide complexes of amino acids

Cited by 85 publications

References 10 publications

Analysis of Aluminum and Divalent Cation Binding to Wheat Root Plasma Membrane Proteins Using Terbium Phosphorescence

Analysis of Aluminum and Divalent Cation Binding to Wheat Root Plasma Membrane Proteins Using Terbium Phosphorescence

A proton nuclear magnetic resonance relaxation study of the glycine, alanine, and lactate complexes of gadolinium(III) in aqueous solution

Spectroscopic Study of the Interaction of Nd3+ with Amino Acids: Phenomenological 4f-4f Intensity Parameters

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