Synthesis and crystal structures of a new mu-bis(tetradentate) Schiff base ligand and its mononuclear iron(III) complex: Iron(III) induced imidazolidine ring hydrolysis of binucleating Schiff base ligand

Zeyrek C., Elmali A., Elerman Y.

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, vol.60, no.5, pp.520-526, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 60 Issue: 5
  • Publication Date: 2005
  • Doi Number: 10.1515/znb-2005-0507
  • Journal Name: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.520-526
  • Keywords: Schiff base, iron complex, imidazolidine ring, crystal structure, conformational analyses, TRANSITION-METAL-COMPLEXES, EXCHANGE INTERACTION, MOLECULAR-STRUCTURE, SPIN-STATE, CONFORMATION, COPPER(II), ZINC(II)
  • Ankara University Affiliated: No

Abstract

The mu-bis(tetradentate) ligand, [C27H26Cl3N4O4], H3L', 1,3-bis[N-(5-chloro-2-hydroxybenzylidene)-2-aminoethyl]-2-(5-chloro-2-hydroxyphenyl)imidazolidine and its mononuclear iron(III) complex, [Fe(L)](ClO4), L = N, N'-bis(5-chloro-2-hydroxybenzylidene)-triethylenctetramine have been synthesized and their crystal structures determined. Minimum energy conformations of the ligand were calculated (MOPAC, AMl) as a function of two torsion angles and the results compared with optimized crystal structure. The ligand (H3L') reacts with Fe(ClO4)(2) (.) 6H(2)O in aqueous methanol to form the mononuclear [Fe(L)](ClO4) complex with the imidazolidine ring cleaved by hydrolysis. The complex has an N4O2 donor atom set forming a distorted octahedral coordination geometry around the metal atom as established from a crystal structure determination. The terminal oxygen donor atoms occupy cis positions, and the remaining four nitrogen atoms (two cis amine and two trans imine) complete the coordination sphere.