Homodinuclear tetradentate Schiff base complexes of nickel(II), cadmium(II) and mercury(II): synthesis, photophysical and mesophase investigation

Abstract

ABSTRACT Dinuclear Ni(II), Cd(II) and Hg(II) complexes have been prepared from photoluminescent salicylaldimine tetra-coordinated [N4O4] donor compartmental Schiff base ligand. The photophysical and mesogenic properties of the compounds are investigated. The compounds are characterized by elemental analyses, mass, 1HNMR, FT-IR and UV–visible spectroscopy. The complexes adopted distorted square planar geometry. The ligand and Ni complex exhibit monotropic thermal transition in DSC thermogram whereas Cd or Hg complexes are non-mesogenic. All the complexes displayed blue emission at ∼450 nm.