Potentiometric, spectrophotometric, theoretical studies and binding properties of a novel tripodal polycatechol-amine ligand with lanthanide(III) ions

Potentially Multidentate Tripodal Amine Catechol Ligands as Chelators for Ga(III) and In(III)

“…]) values of these ligands are found to be higher than the well known chelating agents like EDTA, DTPA, transferrin and comparable with that of DFO (DFO is the one of the approved drug used in Al +3 -intoxication), 17 (ii) the ligand L 1 shows potential to form mononuclear encapsulated complex at nearly physiological condition with lanthanide(III) ions, which is important for use as contrast agents in magnetic resonance imaging 16 and (iii) the stability order found for ligand L 3 with the group-13 metal ions is Al(III) > Ga(III) > In(III), which is unusual for catechol type ligand. 18 Considering the unique solution coordination behavior of tripodal amine catechol ligands, present work aimed to study the thermodynamic stability and selectivity of the ligands L 1 and L 2 towards Ga(III) and In(III).…”

“…16,17 Nitrate salts of gallium and indium were obtained from Sigma-Aldrich and used directly. All other chemicals: potassium hydroxide, hydrochloric acid and potassium chloride were obtained from Merck.…”

“…16 17 were used to evaluate the formation constants of the metal complexes. The first three values were assigned to the hydroxyl groups of catechol units at ortho whereas last three values to the secondary amines.…”

“…In our recent studies, [16][17][18] we demonstrated that C3-symmetrical tripodal amine catechol ligands, cis,cis-1, 3,5-tris[(2,3- [MLH ]…”

Synthesis and Determination of Stability Constants of a New Bis-1,2,4-triazole Ligand for Complexation with Zinc(II), Copper(II) and Nickel(II) in Acetonitrile

“…The design and construction of coordination ligands using the 1,2,4-triazole moiety as a part of a ligand system has gained great attention in recent years [8]. The complexes of 1,2,4-triazole and its derivatives are also good candidates for the construction of various metal coordination polymers [9][10][11][12][13].…”