Complexes of lanthanoid salts with macrocyclic ligands. 36. Macrocyclic effect in lanthanoid complexes with 12-, 15-, 18-, and 21-membered crown ethers

Buenzli, Jean Claude G.; Pilloud, Francis

doi:10.1021/ic00312a027

Cited by 45 publications

(39 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…l A value of 3.39 ± 0.05 can be treated as reliable [89B]. m lg K 2 = 1.77 ± 0.01 has also been found [89BP]. n Values of lg K at other temperatures [97RE]: 6.43 ± 0.07 (15 °C), 5.85 ± 0.05 (35 °C), and 5.55 ± 0.05 (45 °C).…”

Section: Stability Constants and Thermodynamic Functions Of Metal Commentioning

confidence: 99%

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

Arnaud‐Neu¹,

Delgado²,

Chaves³

2003

Pure and Applied Chemistry

118

View full text Add to dashboard Cite

show abstract

Section: Stability Constants and Thermodynamic Functions Of Metal Commentioning

confidence: 99%

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

Arnaud‐Neu¹,

Delgado²,

Chaves³

2003

Pure and Applied Chemistry

118

View full text Add to dashboard Cite

show abstract

“…Solvents were dried by distillation over CaH 2 (CH 2 Cl 2 , MeCN), Na/benzophenone (THF) or KOH (NEt 3 ). [37] Lanthanide triflates [38] and perchlorates [39] were prepared in the usual way, from analytical-grade triflic or perchloric acids and high-purity lanthanide oxides (Rhodia). The Ln content was determined by complexometric titration with H 2 Na 2 A C H T U N G T R E N N U N G (edta) in presence of xylenol orange and urotropine (edta: ethylenediaminetetraacetate).…”

Section: Methodsmentioning

confidence: 99%

Non‐Cytotoxic, Bifunctional Eu^III and Tb^III Luminescent Macrocyclic Complexes for Luminescence Resonant Energy‐Transfer Experiments

Ferrand

Imbert

Chauvin

et al. 2007

Chemistry A European J

View full text Add to dashboard Cite

A new macrocyclic ligand, L3, has been synthesised, based on the cyclen framework grafted with three phenacyl light-harvesting groups and a C5-alkyl chain bearing a carboxylic acid function as a potential linker for biological material. Acidity constants are determined by spectrophotometric titrations, as well as conditional stability constants for the resulting 1:1 complexes with trivalent lanthanide ions. The complexes have stabilities comparable to 1,4,7,10-tetrakis(carbamoylmethyl)-1,4,7,10-tetraazacyclododecane (dtma) complexes, with pLn approximately 12-13. Photophysical properties of the ligand and of the EuL3 and TbL3 complexes have been determined for both microcrystalline samples and solutions in water and acetonitrile. They point to the metal ion being present in an environment with axial symmetry derived from the C4 point group. The hydration number determined for TbL3 decreases with increasing pH value and becomes fractional at pH 7.5, which points to an equilibrium between two differently solvated species and probably to the participation of the deprotonated carboxylic acid chain in the complexation. The quantum yields in water (1.9% for EuIII, 3.4% for TbIII) are smaller than those for complexes with the symmetrically substituted parent macrocycle, but efficient luminescence resonant energy transfer (LRET) was observed when Cy5 dye was added to the solutions. Finally, the influence of the TbL3 complex on cell viability is tested on both malignant (5D10 mouse hybridoma, Jurkat human T leukaemia, MCF-7 human breast carcinoma) and non-malignant (Hacat human keratinocyte) cell lines. Cell viability after 24 h incubation at 37 degrees C with 500 microM TbL3 was >90% for all cell lines, except Jurkat (>70%). All of these properties make LnL3 complexes interesting potential probes for bioanalyses.

show abstract

“…A heterogeneous ion selective electrode based on a nickel complex of 1,4,8,11-tetraazacyclotetradecane was calibrated in 20% DMF solution and was used to determine the stability constant of a nickel sulphosalicylic acid complex [18]. Gokel [20], Cox et al [21] and Bunzli and Pilloud [22] using Ag(I) as an auxiliary cation.…”

Section: Introductionmentioning

confidence: 99%

Stability Constants of Some Macrocyclic Complexes of Ag(I) and Cu(II) in Mixed Solvents by Potentiometry

Sil

Ijeri

Srivastava

2003

Supramolecular Chemistry

View full text Add to dashboard Cite

Stability constants of complexes of Ag(I) and Cu(II) perchlorates and nitrates with some macrocyclic compounds in 90 and 75% (v/v) DMSO 1 water and 75% (v/v) DMF 1 water media have been determined by potentiometry. Silver and copper wires, and Coated Wire Ion Selective Electrodes (CWISE) were used as indicator electrodes. It was observed that complexation is stronger when the salt is present as a perchlorate than when it is as a nitrate. For both cations the stability constant values in 75% (v/v) DMF 1 water were somewhat higher than in 75% (v/v) DMSO. The macrocyclic effect due to cyclization of linear amine tosylates has been observed. Competitive potentiometry has been utilized to compare some of the results.

show abstract

Complexes of lanthanoid salts with macrocyclic ligands. 36. Macrocyclic effect in lanthanoid complexes with 12-, 15-, 18-, and 21-membered crown ethers

Cited by 45 publications

References 0 publications

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

Non‐Cytotoxic, Bifunctional Eu^III and Tb^III Luminescent Macrocyclic Complexes for Luminescence Resonant Energy‐Transfer Experiments

Stability Constants of Some Macrocyclic Complexes of Ag(I) and Cu(II) in Mixed Solvents by Potentiometry

Contact Info

Product

Resources

About

Complexes of lanthanoid salts with macrocyclic ligands. 36. Macrocyclic effect in lanthanoid complexes with 12-, 15-, 18-, and 21-membered crown ethers

Cited by 45 publications

References 0 publications

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

Non‐Cytotoxic, Bifunctional EuIII and TbIII Luminescent Macrocyclic Complexes for Luminescence Resonant Energy‐Transfer Experiments

Stability Constants of Some Macrocyclic Complexes of Ag(I) and Cu(II) in Mixed Solvents by Potentiometry

Contact Info

Product

Resources

About

Non‐Cytotoxic, Bifunctional Eu^III and Tb^III Luminescent Macrocyclic Complexes for Luminescence Resonant Energy‐Transfer Experiments