Potentiometric Studies on the Binary Complexes ofN-[Tris(hydroxymethyl)methyl]glycine with Th⁴⁺, Ce³⁺, La³⁺, and UO₂²⁺and Medium Effects on a Th−Tricine Binary Complex

Abstract

The stability constants for M n+ -tricine binary complexes (1:1 and 1:2), where M n+ ) Th 4+ , Ce 3+ , La 3+ , and UO 2 2+ , have been determined pH-metrically in aqueous media at 25 °C and in the presence of 0.10 mol dm -3 (KNO 3 ). The binary Th-tricine (1:1) complex was studied in the presence of different organic solvents as well as in the presence of different ratios of dioxane and at different temperatures. The calculated stability constants have been discussed in terms of the nature of both the metal ion and tricine. It is suggested that tricine may act as a tridentate as well as a bidentate ligand. Solvent basicity and proportion in addition to the differences in stabilization of the free base by hydrogen bonding with solvent molecules as well as the electrostatic effect are the major factors responsible for the observed high stability of the Th-tricine binary complex. The thermodynamic parameters (∆H, ∆G, and ∆S) for the formation of 1:1 Th-tricine complex in the presence of 40% (w/w) dioxane at different temperatures (5-45 °C) were calculated.

(Un)suitability of the use of pH buffers in biological, biochemical and environmental studies and their interaction with metal ions – a review

“…The complexation of Tris with La, Ce and Th was studied by El-Roudi and co-workers. 68 El-Gahami et al 69,70 studied the complexation of MES and MOPSO with dibutyltin(IV) and dimethyltin(IV) cations. essentially eliminated in Tris buffer.…”

Divalent Transition Metal Ion Mixed-Ligand Complexes of Tricine or Glycylglycine and 8-Hydroxyquinoline: Synthesis, Characterization, and Formation Constants

“…Although the two ligands H 2 L 1 and H 2 L 2 have a comparable basicity (pK a2 8.20 and 8.25 for H 2 L 1 and H 2 L 2 , respectively [17,48] ) the stability of the 1:1 binary metal complex of H 2 L 1 is higher than that of the corresponding binary complex of H 2 L 2 . This behavior can likely be ascribed to The 1:1:1 ternary complex containing H 2 L 2 is more stable than the corresponding one containing H 2 L 1 ligand.…”

Comparative Studies of Some Novel Cu2+ and Fe3+ Chelates Derived From Tricine (L1) by Single Crystal X‐ray, Spectroscopic and Biological Data: Applications to Investigate Antitumor Activity

“…The electronic spectra of the Fe 3+ and Cu 2+ chelates (Figures 11 and S3) were carried out in Nujol mull. The results of the Fe 3+ spectrum shows five bands at 27800, 23700, 20600, 18700 and 17400 cm −1 assignable to 6…”

“…Also, it was used in animal tissue culture . Several studies of tricine with metal ions were reported by complexometric , potentiometric , cyclic voltammetry and polarography methods . Tricine ( L 1 ) acts as an expellant chelating agent forming uni‐, bi‐ and/or tridentate manners via soft donor atoms (carboxylate oxygen, amido nitrogen and alcoholic oxygen groups).…”

“…[2][3][4] Several studies of tricine with metal ions were reported by complexometric, potentiometric, cyclic voltammetry and polarography methods. [5][6][7] Tricine (L 1 ) acts as an expellant chelating agent forming uni-, bi-and/or tridentate manners via soft donor atoms (carboxylate oxygen, amido nitrogen and alcoholic oxygen groups). Moreover, the flexibility of using the donor sites in L 1 depends on the pH values.…”