FTIR study of thermally induced magnetostructural transitions in breathing crystals

Inorganic Chemistry
Sergey L VeberElena G Bagryanskaya

Abstract

"Breathing crystals" based on copper(II) hexafluoroacetylacetonates and pyrazolyl-substituted nitronyl nitroxides comprise the exchange-coupled clusters within the polymeric chains. Owing to an interplay of exchange interaction between copper(II) and nitroxide spins and Jahn-Teller nature of copper(II) complex, the breathing crystals demonstrate thermally and light-induced magnetostructural transitions in many aspects similar to the classical spin crossover. Herewith, we report the first application of variable temperature (VT) far/mid Fourier transform infrared (FTIR) spectroscopy and mid FTIR microscopy to breathing crystals. This VT-FTIR study was aimed toward clarification of the transitions mechanism previously debated on the basis of superconducting quantum interference device, X-ray diffraction, and electron paramagnetic resonance data. VT-FTIR showed the onset of new vibrational bands during phase transitions occurring at the expense of several existing ones, whose intensity was significantly reduced. The most pronounced spectral changes were assigned to corresponding vibrational modes using quantum chemical calculations. A clear-cut correlation was found between temperature-dependent effective magnetic moment of studie...Continue Reading

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Citations

Oct 16, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Matvey V FedinVictor I Ovcharenko
Nov 17, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·I Yu BarskayaM V Fedin
Sep 26, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Irina Yu BarskayaMatvey V Fedin
Apr 18, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Sergey V TumanovMatvey V Fedin
Oct 20, 2017·ChemistryOpen·Evgeny TretyakovNina Gritsan
Nov 1, 2017·The Journal of Physical Chemistry Letters·Xu DongMatvey V Fedin

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