A kinetic study of isotopic exchange reactions between lanthanide ions and lanthanide polyaminopolycarboxylic acid complex ions—I isotopic exchange reactions of Ce(III) with Ce(HEDTA), Ce(EDTA)−, Ce(DCTA)− and Ce(DTPA)2−

Glentworth, P.; Wiseall, B.; Wright, Ciara; Mahmood, Arshed

doi:10.1016/0022-1902(68)80316-1

Cited by 59 publications

(16 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Can The predominant mode of exchange in M(III)/ML-reactions is the decomposition of the protonated complex MLH under the experimental conditions studied (1-12). It has been reported in some of the published investigations (3,7,9) that the rate-determining step during exchange by the predominant mode is the formation of the protonated complex. However, an examination of the available evidence (3,7,9) on the mechanism of exchange does not appear to justify this conclusion, and it seemed therefore important to obtain further evidence concerning the mechanism of exchange in these reactions.…”

Section: Nature Of the Rare Earth Complex Species In Thementioning

confidence: 99%

“…The latter conclusion appears to be further supported by the investigation of Glentworth er al. (3) on the effect of acetate concentration on the exchange of Ce (111) with its multidentate chelates. Can with the buffer concentration (in Fig.…”

Section: Role Of Bufer Anion During Exchange (I) Exchange Experimentsmentioning

confidence: 99%

“…5) and contribution to exchange of a labile mixed complex is not indicated over the region of acetate concentration investigated the only species participating in exchange is TbL-. Glentworth et al (3) have studied the effect of acetate concentra61f the mixed complex is formed directly between TbL-and B-without the initial protonation of the former, the resulting expression for the stability constant will be the same as eq. 23. .…”

Section: (R/[tbl-:i[h+][tb3+]013) Is Shown Inmentioning

confidence: 99%

“…Step During Exchange by the Predominant Mode It has been postulated in the literature (3,7,9) that the rate-determining step during exchange by the predominant mode (proton-assisted decomposition of the chelate ML-, mode 1) is the formation of the protonated complex MLH. However the experimental data in the studies cited d o not appear to justify this conclusion.…”

Section: Slowmentioning

confidence: 99%

“…Several reports have appeared recently in the literature on mixed complex formation by rare earthpolyaminopolycarboxylates with additional ligands present in the medium. It is important to examine the nature of the rare earth complex or complexes in the medium specified for the exchange reactions (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) and characterize precisely the species participating in exchange. This aspect of the exchange reaction (M(III)/ML-) has apparently not been given enough consideration so far in the studies reported on this topic.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Kinetic Study of Isotopic Exchange between Terbium Ion and its EDTA Complex in Aqueous Buffer Systems and the Possible Role of Buffer Anion

Jervis¹,

Neelakantan²

1974

Can. J. Chem.

View full text Add to dashboard Cite

The nature of the species undergoing exchange and the role of the buffer anion in the medium are not known precisely from previous investigations o n the isotopic exchange of rare earth metal ions with their EDTA complexes confined to acetate medium only.Using terbium-160 as radiotracer, the kinetics of self-exchange of Tb(II1) inTbEDTA-has been studied in detail in 0.025 M acetate buffer. The exchange has also been investigated in various other concentrations of acetate and phthalate buffer solutions, and also in benzoate buffer.In 0.025 M ammonium acetate solution the rate of exchange (R in mol 1-' s-') is expressed by over the concentration ranges employed. The predominant mode of exchange is the decomposition of the protonated complex TbHEDTA. It is concluded that the complex TbEDTA-is the only species undergoing exchange, although it is possible that mixed complexes formed between TbEDTA-and acetate ion may be present in the medium. Increasing charge on the buffer anion species accelerates the rate of exchange, while the effect of the buffer anion size is relatively insignificant. A small positive effect observed for the ionic strength on exchange has also been interpreted.La nature des esptces subissant 1'Cchange et le r81e de l'anion-tampon dans le milieu ne sont pas prtcistment connus par les recherches antirieures sur l'tchange isotopique d'ions mttalliques des terres rares avec leurs complexes d'EDTA limitCes en milieu acetate seulement.Utilisant le terbium-160 comme traceur-radio, la cinttique du libre-tchange du Tb(II1) en TbEDTA-a ttC Ctudite en dttail dans un tampon acttate de 0.025 M. L'tchange a aussi t t t examint dans divers autres concentrations de solutions tampon d'acitate et de phtalate, et aussi dans le tampon benzoate.Dans la solution 0.025 M d'acttate d'ammonium la vitesse d'tchange (R e n mol 1-' S-') est exprimte par: pour les intervalles de concentrations utilists. Le mode prtdominant d'tchange est la dtcomposition du complexe TbHEDTA protont. 11 a t t t conclu que le complexe TbEDTA-est la seule des espkces subissant l'ichange, bien qu'il soit possible que des complexes mixtes formts entre TbEDTA-et l'ion acttate soient prtsents dans le milieu. L'augmentation de la charge sur les types d'anions de tampon acctltre la vitesse d'Cchange tandis que l'effet de la grosseur de l'anion du tampon est relativement insignifiant. Un petit effet positif observC pour la force ionique sur 1'Cchange a aussi Ctt interprttt.[Traduit par le journal]Can.

show abstract

Section: Nature Of the Rare Earth Complex Species In Thementioning

confidence: 99%

Section: Role Of Bufer Anion During Exchange (I) Exchange Experimentsmentioning

confidence: 99%

Section: (R/[tbl-:i[h+][tb3+]013) Is Shown Inmentioning

confidence: 99%

Section: Slowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Kinetic Study of Isotopic Exchange between Terbium Ion and its EDTA Complex in Aqueous Buffer Systems and the Possible Role of Buffer Anion

Jervis¹,

Neelakantan²

1974

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

The Development of Zn–Ce Hybrid Redox Flow Batteries for Energy Storage and Their Continuing Challenges

et al. 2014

View full text Add to dashboard Cite

show abstract

Etude par RMN. de polyaminocarboxylates de terres rares, II. Nitrilotriacétates de scandium, yttrium, lanthane et lutécium

Merbach¹,

Gnaegi²

1971

Helvetica Chimica Acta

View full text Add to dashboard Cite

691De la in&me faCon la dihydroxylation de 5 conduit B l'aldbhyde 18 qui n'est pas is016 mais depuis lequel on prkpare 1'0-mkthyloxinie 19 (sirop; [cr]E = +38,2", c = 0,9, CHCl,), l'cr-glycol 20 ( 11 ; ' = -24", c = 1,0, CHC1,) et le carbonate cyclique 26 (sirop; [ c r ] : = -Z O O , c = 0,9, CHCI,). La structure de 21, Cpimkre en 3 de l'O-isopropylid&ne-l,Z-/l-L-streptofurannose est prouvCe par spectroscopie (en particulier RMN.: z = 0,01, s, l p . (CHO)). Sa Que, dans cette sCrie, la dihydroxylation a bien lieu depuis la face la moins en-combrCe de l'alckne est prouv6 par le fait que 12 conduit B 23, identique B un kchantillon authentique prkpark selon [12] depuis des feuilles de Zostera marina, et diffkrent de son kpimkre en 3,24, que nous avons antkrieurement synthCtisC [5]. rkduction permet d'obtenir 22 (F. 86-87'; [a]: = -26,3", c = 0,4, CHClJ. Nous remercions le Fonds National de la Recherche Scientifique d'un subside (no 2123-69). Nous exprimons notre reconnaissance au Prof. A . Buchs

show abstract

A kinetic study of isotopic exchange reactions between lanthanide ions and lanthanide polyaminopolycarboxylic acid complex ions—I isotopic exchange reactions of Ce(III) with Ce(HEDTA), Ce(EDTA)−, Ce(DCTA)− and Ce(DTPA)2−

Cited by 59 publications

References 20 publications

A Kinetic Study of Isotopic Exchange between Terbium Ion and its EDTA Complex in Aqueous Buffer Systems and the Possible Role of Buffer Anion

A Kinetic Study of Isotopic Exchange between Terbium Ion and its EDTA Complex in Aqueous Buffer Systems and the Possible Role of Buffer Anion

The Development of Zn–Ce Hybrid Redox Flow Batteries for Energy Storage and Their Continuing Challenges

Etude par RMN. de polyaminocarboxylates de terres rares, II. Nitrilotriacétates de scandium, yttrium, lanthane et lutécium

Contact Info

Product

Resources

About