Pressure-Controlled Migration of Paramagnetic Centers in a Heterospin Crystal

Victor Ovcharenko, Galina Romanenko, Alexey Polushkin, Gleb Letyagin, Artem Bogomyakov, Matvey Fedin, Kseniya Maryunina, Sadafumi Nishihara, Katsuya Inoue, Marina Petrova, Vitaly Morozov, Ekaterina Zueva

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A study of the single-crystal-to-single-crystal transformation induced by temperature variation for the chain polymer Cu(II) complex with nitronyl nitroxide showed that an increase in the hydrostatic pressure of up to â0.07 GPa completely changes the intracrystalline displacements of molecules relative to one another. This, in turn, significantly affects the interaction energy of the unpaired electrons of the paramagnetic centers and hence the form of the temperature dependence of the magnetic susceptibility χT. The cooling of crystals under normal conditions causes a rearrangement of the intrachain exchange clusters {>N-â¢O-Cu(II)-Oâ¢-N<} accompanied by a shortening of the distances between the paramagnetic centers. This changes the character of exchange interactions and generates multistage spin transitions. An increase in the hydrostatic pressure leads to a drastic change in the O···O distances between the nitroxyl fragments of adjacent chains, an increase in the antiferromagnetic exchange between them, and complete suppression of spin transitions.

Original languageEnglish
Pages (from-to)9187-9194
Number of pages8
JournalInorganic Chemistry
Volume58
Issue number14
DOIs
Publication statusPublished - 26 Jun 2019

Keywords

  • SPIN-CROSSOVER
  • NITRONYL NITROXIDE
  • POLYMERIZATION-DEPOLYMERIZATION
  • MAGNETIC-PROPERTIES
  • PHASE-TRANSITION
  • MN COMPLEXES
  • TEMPERATURE
  • COPPER(II)
  • LIGHT
  • CHAIN

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