Influence of substitute in the ligand and counterion on the properties of heptanuclear iron complex

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Abstract

New heptanuclear mixed-valence iron complexes with pentadentate ligands have been synthesized, and their magnetic properties have been studied. It has been found that the presence of thiocyanate anions leads to the emergence of spin-crossover properties by magnetometry and EPR methods. The insertion of long alkoxy chains into the molecule leads to thermotropic liquid crystalline properties and enhanced cooperative magnetic properties.

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About the authors

Е. Е. Batueva

Kazan Federal University

Email: sasha_turanov@rambler.ru
Russian Federation, Kazan

A. R. Sharipova

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: sasha_turanov@rambler.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

Е. N. Frolova

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: sasha_turanov@rambler.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

L. I. Savostina

Kazan Federal University; Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: sasha_turanov@rambler.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan; Kazan

L. V. Bazan

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: sasha_turanov@rambler.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

M. A. Cherosov

Kazan Federal University

Email: sasha_turanov@rambler.ru
Russian Federation, Kazan

R. G. Batulin

Kazan Federal University

Email: sasha_turanov@rambler.ru
Russian Federation, Kazan

O. A. Turanova

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: sasha_turanov@rambler.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

A. N. Turanov

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Author for correspondence.
Email: sasha_turanov@rambler.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

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Supplementary files

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2. Fig. 1. Synthesis of precursors and heptnuclear complexes: 1 — R = H, X = Cl, 2 — R = H, X = SCN, 3 — R = C18H37O, X = Cl

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3. Fig. 2. Liquid crystal texture of complex 3 at 137 °C

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4. Fig. 3. Dependences of the effective magnetic moment (μeff in Bohr magnetons) on temperature: black line – complex 1, red line – complex 2, blue line – complex 3.

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5. Fig. 4. EPR spectra of complex 2 (a) and 3 (b) at different temperatures.

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6. Fig. 5. Results of simulating the spectra of complex 2: experimental signal (red) and simulated spectrum (blue) and its components from the BC and NS complexes (dashed lines) (a); temperature dependence of the integral intensities of the selected spectrum components (b), squares are BC components, triangles are NS components.

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