Incorporation of a sodium ion guest in the host of copper(II)-Schiff-base complexes: Structural characterization and magnetic study

Pampa Mukherjee, Michael G.B. Drew, Albert Figuerola*, Ashutosh Ghosh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Three copper(II) complexes, [CuL1], [CuL2] and [CuL3] where L1, L2 and L3 are the tetradentate di-Schiff-base ligands prepared by the condensation of acetylacetone and appropriate diamines (e.g. 1,2-diaminoethane, 1,2-diaminopropane and 1,3-diaminopropane, respectively) in 2:1 ratios, have been prepared. These complexes act as host molecules and include a guest sodium ion by coordinating through the oxygen atoms to result in corresponding new trinuclear complexes, [(CuL1)2Na(ClO4)(H2O)] [CuL1] (1), [(CuL2)2Na(ClO4)(H2O)] (2) and [(CuL3)2Na(ClO4)(H2O)] (3) when crystallized from methanol solution containing sodium perchlorate. All three complexes have been characterized by single crystal X-ray crystallography. In all the complexes, the sodium cation has a six-coordinate distorted octahedral environment being bonded to four oxygen atoms from two Schiff-base complexes of Cu(II) in addition to a perchlorate anion and a water molecule. The copper atoms are four coordinate in a square planar environment being bonded to two oxygen atoms and two nitrogen atoms of the Schiff-base ligand. The variable temperature susceptibilities for complexes 1-3 were measured over the range 2-300 K. The isotropic Hamiltonian, over(H, ^) = g1 β HS1 + g2 β HS2 + J12 S1 S2 + g3 β HS3 for complex 1 and over(H, ^) = g1 β HS1 + g2 β HS2 + J12 S1 S2 for complexes 2 and 3 has been used to interpret the magnetic data. The best fit parameters obtained are: g1 = g2 = 2.07(0), J = -1.09(1) cm-1 for complex 1, g1 = g2 = 2.06(0), J = -0.55(1) cm-1 for complex 2 and g1 = g2 = 2.07(0), J = -0.80(1) cm-1 for 3. Electrochemical studies displayed an irreversible Cu(II)/Cu(I) one-electron reduction process.

Original languageEnglish (US)
Pages (from-to)3343-3350
Number of pages8
JournalPolyhedron
Volume27
Issue number16
DOIs
StatePublished - Nov 5 2008

Keywords

  • Copper(II)
  • Magnetic properties
  • Schiff base
  • Sodium perchlorate adduct
  • X-ray structure

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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