Liquid Crystalline Octahedral Iron(III) Complexes with 1,4,7-Tris[3,4-bis(decyloxy)benzyl]-1,4,7-triazacyclononane: Thermal Characterization and Mössbauer Investigations of Bridging and Redox Behavior
The complexation of iron(III) chloride with 1,4,7-tris[3,4-bis(decyloxy)benzyl]-1,3,7-triazacyclononane leads to a liquid crystalline product, which forms a second mesophase after thermal treatment at around 70 degrees C above the first clearing temperature. Polarizing microscopy, DSC, and UV observations reveal a transformation, which was further investigated by Mossbauer spectroscopy. In different temperature ranges, various octahedral, binuclear iron(III) complexes are present along with a monomeric species. In the presence of water and oxygen, the iron(III) center participates in a redox equilibrium.