Crystal structures and magnetic properties of newly synthesized mono- and dinuclear CuII Schiff-base complexes

Snehadrinarayan Khatua, Jina Kang, Kibong Kim, Jung Oh Huh, Junseong Lee, Chang Seop Hong, David G. Churchill

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Five CuII Schiff-base complexes, three mononuclear {[Cu(rslysH)•(H2O)2]•2H2O• ClO4 (1); [Cu(rslysH)Cl] (2); [Cu(slysH)(H2O)Cl] (3) rslys and slys = 6-amino-2-[(2-hydroxybenzylidene)amino]hexanoate} and two dinuclear {[Cu2(rslysH)2(CH3OH)2]•(H 2O)2(NO3)2 (4); [Cu 2(slysH)2(NO3)2]•(H 2O)3 (5)}, are reported herein. These complexes have been synthesized via a facile "one-pot" method in which the D/L- and L-lysine Schiff-base ligands are generated in situ. Various spectroscopic techniques and single-crystal X-ray diffraction were used in compound characterization. The X-ray diffraction studies revealed that complexes 1-3 are mononuclear; further, 4 and 5 are dinuclear in which two CuII centers are phenolate-bridged. Complexes 1, 2 and 3 are structurally similar, according to the nuclearity and the coordination environment around the metal center involving a tridentate D- or L-lysine-derived Schiff-base ligand. But the crystallographic packing is different, owing to the different counterions and number of solvent molecules present in the crystals. Compounds 1 and 2 are racemic due to the co-existence of chiral D- and L-lysine-based Schiff-base ligands. These copper(II) complexes give 2-D hydrogen-bonded networks and are racemic overall. Compound 3 is chiral, containing only the L-lysine-derived ligand in which a cylindrical 1-D hydrogen-bonded structure is observed in the solid state. Both 4 (achiral) and 5 (chiral) reveal 3-D hydrogen-bonded networks. A strong antiferromagnetic coupling interaction was observed by variable-temperature magnetic susceptibility measurements; this interaction is likely mediated through the phenolate bridge between the two CuII centers in 4 and 5. Five new copper(II) complexes (three mono and two dinuclear) were synthesized by a one-pot method in which the Schiff-base ligands were formed in situ and characterized by various spectroscopic techniques and single-crystal X-ray diffraction.

Original languageEnglish
Pages (from-to)5018-5026
Number of pages9
JournalEuropean Journal of Inorganic Chemistry
Issue number31
DOIs
Publication statusPublished - 2010 Nov

Keywords

  • Copper
  • Hydrogen bonds
  • Magnetic properties
  • Schiff bases

ASJC Scopus subject areas

  • Inorganic Chemistry

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