Studies in amine-amino acid mixed ligand chelates—I

Chidambaram, M. V.; Bhattacharya, P. K.

doi:10.1016/0022-1902(70)80210-x

Cited by 62 publications

(30 citation statements)

References 7 publications

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“…Although uartial aoueous medium (40% v /v ethanol-water) was used and the earlier literature reveals that their coordination chemistry is &perim&ta pH-meter rkadings' were corrected by using the Van-limited mainly to complexes with oxygen, or oxygen-nitrogen Uitert technique (15). The Irving-Rossotti approach (16) and its I donors (4,5) some investigations have been carried out recently extension as applicable to ternary systems (17) were used for I on their complexes with oxygen-sulphur (6, 7) and nitrogen computing the proton-ligand and metal-ligand association constants.…”

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Relative complexing tendencies of O—O, O—N, and O—S donor (secondary) ligands in some lanthanide–EDTA mixed-ligand complexes

Limaye¹,

Saxena²

1986

Can. J. Chem.

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S. N. LIMAYE and M. C. SAXENA. Can. J. Chem. 64, 865 (1986).Meta-ligand association constants of 1: 1 binary (ML) and 1: 1: 1 ternary (MAL) complexes of the type M + A = MA; MA + L = MAL (where M = ~a~+ , ce3+, PI^+, ~d~+ , or Sm3+; A = primary ligand = EDTA; L = secondary ligand = 0-0, 0-N, 0-S donor aliphatic or aromatic ligand) have been determined potentiometrically by the Irving-Rossotti titration technique at ionic strength 0.2 (mol dmp3 NaC104) and 25°C. Differences between log KML and log KMAL are negative; this may be chiefly due to electrostatic repulsion between the primary binary complex and the incoming secondary ligand during the formation of the mixed-ligand complexes. The relative complexing tendencies of various secondary ligands have been found to

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“…The formation functions of the protonated ligand, iiH, and of the metal complex, ii, and the free-ligand exponent, pL, have been calculated from the titration curves in the usual manner (17).…”

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confidence: 99%

Relative complexing tendencies of O—O, O—N, and O—S donor (secondary) ligands in some lanthanide–EDTA mixed-ligand complexes

Limaye¹,

Saxena²

1986

Can. J. Chem.

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“…The significantly smaller entropy changes indicate that there is a much smaller dehydration associated with oxalic acid and SRE. For oxalic acid, n = 0.839, which is slightly lower than unity; thus, the complex reaction involves a combination of the 41 and amino groups, 42,43 respectively. The affinity to Cu 2+ follows the pattern SRE > oxalic acid > leucine > proline > serine (Table 1).…”

Section: ■ Materials and Methodsmentioning

confidence: 96%

Interactions, Transformations, and Bioavailability of Nano-Copper Exposed to Root Exudates

Huang

Zhao

Keller

2017

Environ. Sci. Technol.

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Due to the potential for interactions between crop plants and engineered nanomaterials (ENMs), there is increasing interest in understanding the bioavailability and effects of ENMs released into soil systems. Here, we investigate the influence of root exudates on the fate of ENMs from a thermodynamic perspective. Nano isothermal titration calorimetry was applied to determine thermodynamic parameters for the interaction between nanocopper (nCu) and synthetic root exudate (SRE) and its components (including sugars, organic acids, amino acids, and phenolic acids), as well as Cu2+ and SRE. The measured binding constant (K d = 5.645 × 103 M–1) indicated strong interactions between nCu particles and SRE, as well as with individual organic acids. The interaction between Cu2+ and SRE was stronger (K d = 7.181 × 104 M–1) but varies for the individual SRE components. nCu dissolution in the presence of SRE was the predominant interaction. In addition, SRE resulted in a complex transformation of nCu, where Cu2+, Cu+, and Cu0 were formed via oxidation and reduction. Plant–nCu exposure experiments indicate that the binding of SRE with nCu and dissolved Cu ions can significantly decrease Cu uptake and bioaccumulation in plants. nITC provides a fundamental thermodynamic understanding of interactions between nCu and plant root exudates, providing an important tool for understanding plant NP-interactions.

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“…Considering the Irving and Rossotti equations derived for binary complexes, a new set of equations was obtained for the calculation of the stability constants of ternary complexes (Chidambaram & Bhattacharya 1970a;Chidambaramm & Bhattacharya 1970b). Expressions for average number of secondary ligand (X) molecules attached per complex ML, n mix and free secondary ligand exponent, p L mix are given in equations 6 and 7.…”

Section: Ternary Systemsmentioning

confidence: 99%

Study on mixed ligand complexes of Pb(II) with EDTA and dietary ligands to investigate the applicability on chelation therapy

Chandrathilaka

Hettiarachchi

2017

Ceylon J. Sci.

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Lead is the most distributed toxic metal in the world and chelation therapy is a remedy for removing it from the body, if a person is intoxicated. Stability constants of both binary and mixed ligand complexes of Pb(II) with salicylic acid, ascorbic acid, vitamin B 1 (thiamine), vitamin B 3 (niacin) and Na 2 EDTA were potentiometrically studied, in aqueous media at the temperature of 37.0 ± 0.2 ⁰ C and the ionic strength of 0.15 mol dm -3 in order to identify better mixed ligand systems suitable for chelation therapy of lead. Both metal-ligand and proton-ligand formation constants were calculated using IrvingRossotti equations. The Formation of ternary complexes was further confirmed theoretically by plotting composite curves. Δ log K values calculated revealed that all mixed complexes were more stable than the complexes of corresponding binary systems. EDTA-Vitamin B 1 and EDTA-Ascorbic mixed complexes with Pb(II) disclosed very high stability constants, which were two times greater than that of EDTA binary complex. Vitamin B 1 revealed a remarkably high ability in forming mixed ligand complexes with all other four ligands. Results of this work clearly indicate that (EDTA-Vitamin B 1 ), (EDTA-Ascorbic), (Vitamin B 1 -Ascorbic), (Vitamin B 1 -Salicylic) and (Vitamin B 1 -Vitamin B 3 ) combinations can be used for detoxification of lead more effectively using dietary ligands.

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Studies in amine-amino acid mixed ligand chelates—I

Cited by 62 publications

References 7 publications

Relative complexing tendencies of O—O, O—N, and O—S donor (secondary) ligands in some lanthanide–EDTA mixed-ligand complexes

Relative complexing tendencies of O—O, O—N, and O—S donor (secondary) ligands in some lanthanide–EDTA mixed-ligand complexes

Interactions, Transformations, and Bioavailability of Nano-Copper Exposed to Root Exudates

Study on mixed ligand complexes of Pb(II) with EDTA and dietary ligands to investigate the applicability on chelation therapy

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