Synthesis and Characterization of Copper (II) Chelates Derived from Tetradentate Ligands Having Nitrogen and Sulfur Donors

Abstract

Twenty copper(II) chelate compounds were prepared and characterized by elemental analyses, magnetic moments, infrared, and UV-visible spectra. The general formulation CuLX₂ obtains when X = Cl⁻, Br⁻, NO₃ ⁻, and ClO₄ ⁻, but Cu₂LX₂ appears to obtain when X = SO₄. The 1igands (L) used include 1,8-diamino-3,6-dithiaoctane, 1,8-bis(2-pyridyl)-3,6-dithiaoctane, 4-methyl-1,8-bis(2-pyridyl)-3,6-dithiaoctane and 1,9-bis(2-pyridyl)-3,7-dithianonane. Variation of anions, ligand chelate ring size, and obligatory steric bulk is discussed in relation to the complexes physical properties and stereodynamics.