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Synthesis of gadolinium(III) and samarium(III) complexes of new potentially heptadentate (N4O3) tripodal Schiff base ligands, and a theoretical study

Salehzadeh, S ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.1016/j.poly.2005.03.099
  3. Publisher: 2005
  4. Abstract:
  5. Two new potentially heptadentate N4O3 Schiff base ligands {N[(CH2)3NCH(2-OH-3,5-t-Bu2C 6H2)]3} (H3L1) and {N[(CH2)3NCH(2-OH-3,5-t-Bu2C6H 2)]2 [(CH2)2-NCH(2-OH-3,5-t-Bu 2C6H2)]} (H3L2) were synthesized and characterized by various spectroscopic methods. The heptadentate N4O3 Schiff bases, H3L1 and H 3L2, were derived from the condensation reaction of two tripodal tetraamine ligands, tris(3-aminopropyl)amine and (2-aminoethyl)-bis(3- aminopropyl)amine with 3 equiv. of 3,5-di-tert-butylsalicylaldehyde, respectively. The neutral gadolinium(III) and samarium(III) complexes, [Ln(L)], of these bulky ligands and also a gadolinium(III) complex of a previously known ligand, {N[CH2CH2NCH(2-OH-3,5-t-Bu2C 6H2)]3} (H3L3), were also synthesized. All complexes were characterized by microanalysis, conductivity measurements, IR and UV-Vis spectra. The lanthanide atom is believed to be hepta-coordinate in the resulting complexes. The relative capability of H 3L1, H3L2 and H3L 3 as well as their unsubstituted analogs to encapsulate a lanthanide ion, herein La(III), has been theoretically studied by ab initio restricted Hartree-Fock (RHF) and density functional B3LYP methods. © 2005 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Ab initio ; Tripodal ligands ; Schiff bases ; Lanthanide ion ; Heptadentate
  8. Source: Polyhedron ; Volume 24, Issue 12 , 2005 , Pages 1478-1486 ; 02775387 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S027753870500255X