Affinities of racemic and meso forms of N,N'-ethylenebis[2-(o-hydroxyphenyl)glycine] for divalent and trivalent metal ions

Bannochie, C. J.; Martell, Arthur E.

doi:10.1021/ja00195a029

Cited by 65 publications

(64 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These species present a similar structure to the Fe 3+ species defined for these ligands and described by Yunta et al (2003a,b) with an octahedral coordination around the metals. However, the close values for the Mn stability constants obtained for o,o-EDDHA and o,p-EDDHA supports the fact that the axial donor groups may be only weakly interacting with the metallic ion in agreement with the Bannochie and Martell (1989) data for Zn (Figure 1). Although Mn can present different oxidation numbers due to its variable electronic configuration (4s 2 3d 5 ) (Wallace and Wallace, 1983b,c), probably the most stable ion in the chelates is Mn 2+ , this accords with other reports that have described a stability complex with Mn 3+ and EDTA but with faster kinetics to form the Mn 2+ complex (Klewicki and Morgan, 1998 Mn 2+ = pe − 25.55 ) than those defined for the same cations with similar chelating agents to EDDHA (Bannochie, and Martell, 1989;L'Eplattenier et al, 1966).…”

Section: Theoretical Speciation Of Fe Mn and Zn Chelates In Hydroponsupporting

confidence: 81%

Novel chelating agents as manganese and zinc fertilisers: characterisation, theoretical speciation and stability in solution

López-Rayo

Correas

Lucena

2012

Chemical Speciation & Bioavailability

View full text Add to dashboard Cite

Mineral, complex and chelated micronutrient fertilisers are widely used in agriculture. However, there have been few studies on manganese and zinc fertilisers. In fact, specific chelating agents to provide these micronutrients to plants have not been found, in contrast to iron. This work considers the interactions of novel and traditional ligands in micronutrient mixtures used in hydroponics and fertigation. Theoretical speciation studies comparing the stability in solution have been carried out to simulate the possible interactions that can affect Fe, Mn and Zn in aqueous formulations containing these micronutrients. Unknown stability constants of ligands with Zn and Mn have been determined. Also, theoretical speciation investigations in hydroponic conditions have been carried out. It has been found that the new chelating agents, IDHA and EDDS, and the poorly studied o,p-EDDHA, can be good alternatives to the traditional sources such as EDTA, HEEDTA and DTPA principally for Zn fertilisers. The Mn and Zn chelates with o,p-EDDHA and complexes with lignosulfonate and gluconate have also shown high stability in a hydroponic nutrient solution, maintaining more than 80% Mn in solution until pH 10. The presence of o,o-EDDHA/Fe 3+ and o,p-EDDHA/Fe 3+ enhances the stability of Zn in solution in the mixed fertilisers. More studies with substrates are necessary to confirm these results and to extend them to other agronomic conditions.

show abstract

Section: Theoretical Speciation Of Fe Mn and Zn Chelates In Hydroponsupporting

confidence: 81%

Novel chelating agents as manganese and zinc fertilisers: characterisation, theoretical speciation and stability in solution

López-Rayo

Correas

Lucena

2012

Chemical Speciation & Bioavailability

View full text Add to dashboard Cite

show abstract

“…a Ma and Martell (1993) b Bannochie and Martell (1989) c Smith and Martell (1989) Fig (Fig. 2), is used, Fe precipitation in the growth media or at root surfaces were not expected and the Si effect on internal plant mechanisms could be studied.…”

Section: Iron Deficiencymentioning

confidence: 99%

Can silicon partially alleviate micronutrient deficiency in plants? a review

Hernández‐Apaolaza

2014

Planta

138

View full text Add to dashboard Cite

Silicon protects plants against various biotic and abiotic stresses, including metal toxicity. Under a high metal concentration, Si can externally decrease metal availability to the plant by its precipitation in the growth media, and Si also affects the metal distribution inside the plant, diminishing the damage. Could Si also protect plants against metal deficiency stress? Recently, the physiological role of Si in relation to micronutrients deficiency symptoms has been assessed in several plant species in hydroponics. In cucumber, Si supply mitigated the symptoms of Fe deficiency, but this effect was not clear under Zn-or Mndeficiency conditions. The main factor controlling this beneficial effect seems to be the Si contribution to the formation of metal deposits in the root and/or leaves apoplast and its role in their following remobilization when required. The enhancement of the content of long-distance transport molecules (such as citrate) due to Si addition should also contribute to the metal transport from root to shoot, which will diminish deficiency symptoms.

show abstract

“…HBED is a relative of EDDHA; both have higher specificity for Fe 3 + than the EDT A family of chelators because HBED and EDDHA contain phenolic ligands. HBED was used in this modelling because of the complexity of chelation by EDDHA; modelling of EDDHA is no longer considered valid since Bannochie and Martell (1989) showed that EDDHA is comprised of several optical isomers with different metal chelate fonnation constants. HBED is simpler, and the fonnation constant database is more complete for HBED than for EDDHA (see Parker et al, 1993).…”

Section: Physiological Aspects Of Zn Phytoxicitymentioning

confidence: 99%