Preparation of the Schiff Base Complexes of Lanthanide(III) Ions

Abstract

The 1 : 1 complexes of lanthanide(III) ions such as La(III), Pr(III), Nd(III), Gd(III) and Er(III) with tris-(salicylidene amino)-triethylenetetramine have been prepared. Among these complexes, the lanthanum(III) complex is unique in infrared spectra and solubility to the solvents; it is soluble in chloroform and nitrobenzene and found to be dimeric in chloroform solution. The other lanthanide(III) complexes are practically insoluble in any available solvents, and are assumed to be polymeric.

Syntheses, Crystal Structures and Photophysical Properties of Two Doubly μ‐Phenoxo‐Bridged LnIII (Ln = Pr, Nd) Homodinuclear Schiff Base Complexes

“…[40] The reaction of triethylenetetramine and salicylaldehyde in 1:3 molar ratio in methanol affords the µ-bis(tetradentate) ligand H 3 api through the formation of an imidazolidine ring in place of the ethylenediamine part of the parent hexadentate precursor. This semi-rigid 2-hydroxyphenyl-substituted five-membered imidazolidine ring inside the ligand backbone acts as a spacer-cum-bridging-cum-heterocyclic backbone unit.…”

Novel gallium(III) complexes transported by MDR1 P-glycoprotein: potential PET imaging agents for probing P-glycoprotein-mediated transport activity in vivo

“…We sought an alternative strategy focused on discovering a nonmetabolized Pgp-targeted PET agent. Schiff-base ligands [20][21][22] and amine phenol ligands [23,24] possessing an N 4 O 2 donor core are well known. Gallium(III) complexes of selected Schiff-base ligands show potential as positron-emitting radiopharmaceuticals for use in myocardial perfusion imaging [25][26][27][28].…”

μ-Phenolato-μ-benzoato-bridged Dinuclear Copper(II) Cluster with a Ferromagnetic Coupling

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51Schiff-bases, 2-(2-hydroxyphenyl)-1,3-bis(2-(2-hydroxy benzylideneamino)ethyl)imidazolidine (H3L) and its substituted derivatives are interesting dinucleating ligands, because they have three phenolate groups within the imdazolidine ligand, and afford dinuclear metal complexes with a cluster-like framework. [1][2][3][4][5][6][7] Recently, we reported on the crystal structure of a dinuclear copper(II) complex with the chloro-derivative of the Schiff-base ligands, 2-(5-chloro-2-hydroxyphenyl)-1,3-bis(2-(5-chloro-2hydroxybenzylideneamino)ethyl)imidazolidine (H3LCl). 6 In this study, we continued our study on these Schiff-base ligands, isolated a new dinuclear copper(II) complex with LCl 3-, and determined the crystal structure of the complex, which has a unique dinuclear structure, as shown in Fig.

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