STRUCTURE AND PHASE TRANSITIONS OF AZOMETHINE BILIGAND COMPLEXES OF IRON(III) BASED ON 3,4,5-TRI(TETRADECYLOXY)BENZOYLOXY-4-SALICYLIDENE-N'-ETHYL-N-ETHYLENEDIAMINE
U. V. Chervonova1, M. S. Gruzdev1, A. M. Kolker1, O. B. Akopova2
1Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia
2Ivanovo State University, Ivanovo, Russia
Keywords: комплексы железа(III), основание Шиффа, строение, масс-спектрометрия, мезоморфизм, iron(III) complexes, Schiff base, structure, mass spectrometry, mesomorphism
Abstract
New biligand complexes of iron(III) are synthesized based on 3,4,5-tri(tetradecyloxy)benzoyloxy-4-salicylidene-N'-ethyl-N-ethylenediamine azomethine with the outer sphere NO3, PF6, Cl-, BF4, Cl4, and CNS- anions. All the target compounds are characterized by gel exclusion chromatography, elemental analysis, and electron, IR, and NMR spectroscopy. The presence of complex-forming ions is confirmed by FT-IR spectra in the far region. The formation of biligand polychelate complexes with an octahedral packing of the iron ion is observed. Phase transitions in the resulting coordination compounds are studied by differential scanning calorimetry and optical polarizing thermomicroscopy. The presence of several polymorphic crystalline modifications, as well as mesophases, is established. Mesomorphic properties are found for complexes with chloride and tetrafluoroborate anions.
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