Innere Komplexsalze der Erdalkalimetalle

Pfeiffer, P.; Simons, H.

doi:10.1002/cber.19430760902

Cited by 9 publications

(4 citation statements)

References 2 publications

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Contrasting

Order By: Relevance

“…This order of stability of the complexes of the heavy metals is the same as that which has been observed by other investigators for other complex-forming agents (3,4,5).…”

Section: Tablesupporting

confidence: 87%

“…In cases where a mixed complex system of one colored and one noncolored complex was investigated, only one wave length was used in the calculations, Fig. 4. Absorption spectra at pH 8.65 of complexes formed from ethylenediaminetetraacetic acid: , cadmium complex; O, zinc complex; #, calcium complex; , zinc-calcium mixed complexes; V, zinc-cadmium mixed complexes; , calcium-cadmium mixed complexes.…”

Section: Tablementioning

confidence: 99%

See 1 more Smart Citation

The Spectrophotometric Determination of Displacement Series of Metal Complexes of the Sodium Salts of Ethylenediaminetetraacetic Acid.

Plumb¹,

Martell²,

Bersworth³

1950

J. Phys. Chem.

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“…This order of stability of the complexes of the heavy metals is the same as that which has been observed by other investigators for other complex-forming agents (3,4,5).…”

Section: Tablesupporting

confidence: 87%

Section: Tablementioning

confidence: 99%

The Spectrophotometric Determination of Displacement Series of Metal Complexes of the Sodium Salts of Ethylenediaminetetraacetic Acid.

Plumb¹,

Martell²,

Bersworth³

1950

J. Phys. Chem.

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“…Differences in the stability of the complexes of various metals with ethylene dinitrilo tetraacetic acid or with nitrilo triacetic acid are possible (I, 2, [12][13][14][15][16][17][18][19][20][21]. In addition it is likely that the optimal concentration required for any metal other than iron may be far different than that used, in agreement with the data of Marvel et al (S, 9).…”

Section: Discussionsupporting

confidence: 65%

Use of Alternative Activators in 41° F. Polymerization Recipes

Mitchell¹,

Spolsky²,

Williams³

1949

Ind. Eng. Chem.

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“…In 1942 Brintzinger reported complexation between ethylendiaminetetraacetic acid (EDTA) and lanthanum, neodymium, and thorium. Studies by Pfeiffer (10,11) and…”

Section: Early Studiesmentioning

confidence: 97%

Lanthanide Aminopolycarboxylates

Choppin

Wong

1994

ACS Symposium Series

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Complexation by aminopolycarboxylate ligands has been a major area of research in lanthanide chemistry for almost five decades. From the 1950's, when the use of EDTA and HEDTA in ion exchange separations first provided multigram amounts of lanthanides of high purity to GdDTPA, which is currently utilized as an MRI agent, aminopolycarboxylates and f-elements have had a close association. Data from thermodynamics, kinetics, NMR, and luminescence are discussed to reflect the present understanding of the role of the carboxylate and nitrogen donors, of the number and size of chelate rings, and of hydration in these complexes. Results of recent studies of complexes of bis(amide) derivatives of DTPA are also discussed to illustrate further the significant factors in lanthanide -aminopolycarboxylate complexation.The lanthanide family of elements has played an important role which can be expected to continue in the development of coordination chemistry. In the early history of these elements, their close chemical similarity in the stable tripositive oxidation state made the task of achieving high purity for individual elements very difficult. Although the entire lanthanide series had been discovered by 1907 (with the exception of Pm) and mixtures of lanthanides had been found in more than a hundred minerals, it was not until efficient separation methods were developed that detailed and diverse studies of their coordination chemistry could be undertaken.The coordination chemistry of the lanthanide elements has interesting aspects because of the relatively high charge density of the cations, the strongly electrostatic nature of their bonding, and the variety of coordination numbers attained in different complexes. The regular, relatively small decrease in ionic radii across the family from La(in) through Lu(DI) (the lanthanide contraction) results in relatively small differences in chemical properties between the elements in the same oxidation state. Although similar radial contractions are observed for other rows of metals in the periodic table (e.g., 3d transition elements), the lanthanide contraction is much smaller. The effective ionic radius (7) of 57La 3 +(4f0) is 1.216 À (CN = 9) and that of 7iLu 3+ (4fl4), 0.977 Â (CN = 8), respectively. While the ionic radii of Ca 2+ (r = 1.00 A, CN = 6) and Na+ (1.02 À, CN = 6) fall in the range of tripositive lanthanide radii and also exhibit strongly ionic bonding, the lanthanide cations have higher charge

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Innere Komplexsalze der Erdalkalimetalle

Cited by 9 publications

References 2 publications

The Spectrophotometric Determination of Displacement Series of Metal Complexes of the Sodium Salts of Ethylenediaminetetraacetic Acid.

The Spectrophotometric Determination of Displacement Series of Metal Complexes of the Sodium Salts of Ethylenediaminetetraacetic Acid.

Use of Alternative Activators in 41° F. Polymerization Recipes

Lanthanide Aminopolycarboxylates

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