Field-induced single-ion magnet based on a quasi-octahedral Co(II) complex with mixed sulfur–oxygen coordination environment

D. V. Korchagin; Ya. E. Gureev; E. A. Yureva; G. V. Shilov; A. V. Akimov; E. Ya. Misochko; R. B. Morgunov; K. V. Zakharov; A. N. Vasiliev; A. V. Palii; T. Lohmiller; K. Holldack; S. M. Aldoshin

doi:10.1039/D1DT02413B

Field-induced single-ion magnet based on a quasi-octahedral Co(ii) complex with mixed sulfur–oxygen coordination environment†

D. V. Korchagin,

*^a Ya. E. Gureev,^ab E. A. Yureva,

^a G. V. Shilov,

^a A. V. Akimov,

^a E. Ya. Misochko,

^a R. B. Morgunov,^a K. V. Zakharov,^b A. N. Vasiliev,

^bc A. V. Palii,

^ad T. Lohmiller,

*^e K. Holldack

^f and S. M. Aldoshin

^a

Author affiliations

* Corresponding authors

^a Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1, Acad. Semenov Av., Chernogolovka, Russian Federation
E-mail: korden@icp.ac.ru

^b M.V. Lomonosov Moscow State University, Moscow 119991, Russia

^c National University of Science and Technology “MISiS”, Moscow, Russia

^d Institute of Applied Physics, Academy of Sciences of Moldova, Kishinev, Moldova

^e EPR4Energy Joint Lab, Department Spins in Energy Conversion and Quantum Information Science, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany

^f Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany

Abstract

Synthesis and characterization of structure and magnetic properties of the quasi-octahedral complex (pipH₂)[Co(TDA)₂] 2H₂O (I), (pipH₂²⁺ = piperazine dication, TDA²⁻ = thiodiacetic anion) are described. X-ray diffraction studies reveal the first coordination sphere of the Co(II) ion, consisting of two chelating tridentate TDA ligands with a mixed sulfur–oxygen strongly elongated octahedral coordination environment. SQUID magnetometry, frequency-domain Fourier-transform (FD-FT) THz-EPR spectroscopy, and high-level ab initio SA-CASSCF/NEVPT2 quantum chemical calculations reveal a strong “easy-plane” type magnetic anisotropy (D ≈ +54 cm⁻¹) of complex I. The complex shows field-induced slow relaxation of magnetization at an applied DC field of 1000 Oe.

Dalton Transactions

Field-induced single-ion magnet based on a quasi-octahedral Co(ii) complex with mixed sulfur–oxygen coordination environment†

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Field-induced single-ion magnet based on a quasi-octahedral Co(II) complex with mixed sulfur–oxygen coordination environment

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