INVESTIGATION OF DEHYDRATION OF THE HYDRATE OF NEUTRAL SPIN-CROSSOVER COMPLEX Fe(III) BASED ON PYRUVIC ACID THIOSEMICARBAZONE LIGAND BY THE METHOD OF GAMMA-RESONANCE SPECTROSCOPY

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Abstract

The article presents the results of the study of the dehydration of the hydrate of the neutral spin-crossover (S = 5/2 ↔ S = 1/2) complex [FeIII(Hthpy)(thpy)]· H2O (1) based on pyruvic acid thiosemicarbazone ligand (H2thpy) using the temperature-dependent gamma-resonance spectroscopy on ⁵⁷Fe nuclei. It is suggested for the first time that the release of water from the structure of polycrystalline sample 1 in the temperature range of 92–160 °C is associated with the formation of the neutral complex [FeII(Hthpy)2] (3) stabilized in the high-spin state (S = 2). A comparative analysis of the spectral parameters of complex 1 and the anhydrous neutral spin-crossover complex [FeIII(Hthpy)(thpy)] (2) reveals that 2 retains its spectral characteristics when heated in air in a similar temperature range.

About the authors

M. A Blagov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: spitsina@icp.ac.ru
Chernogolovka, Russia

A. S Lobach

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: spitsina@icp.ac.ru
Chernogolovka, Russia

S. V Simonov

Osipyan Institute of Solid State Physics, Russian Academy of Sciences

Author for correspondence.
Email: spitsina@icp.ac.ru
Chernogolovka, Russia

N. G Spitsyna

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: spitsina@icp.ac.ru
Chernogolovka, Russia

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