Mesomorphic azomethine complexes of Iron(III) based on 4,4′-dodecyloxybenzoyloxybenzoyl-4-salicylidene-2-aminopyridine

Abstract

A new series of liquid crystalline (LC) complexes Fe(III) based on azomethine 4,4′-dodecyloxybenzoyloxybenzoyl-4-salicylidene-2-aminopyridine with counter-ions PF₆⁻, NO₃⁻, Cl⁻, BF₄⁻, ClO₄⁻, CNS⁻ and SO₄^2– was synthesised. According to elemental analysis, FT-IR, ¹H-NMR and mass spectrometry (MALDI ToF), it was found that bi(ligand) Fe(III) complexes were formed with octahedral packing of the metal ion. The presence of the counter-ion in the complexes was confirmed by Infrared spectroscopy. The thermotropic LC properties were investigated by differential scanning calorimetry (DSC) and polarising optical microscopy (POM). All the seven complexes in this series exhibit thermotropic mesophases.

Keywords:

• Iron (III)
• liquid crystalline complexes
• Schiff base
• octahedral packing

Acknowledgements

The work was carried out with the financial support of the grants of Russian Foundation for Basic Research No. 2-03-31006-mol_a, No.11-03-01028 and, in part, Programme of Presidium RAS No. 24.