Hexanuclear and Heptanuclear Nickel(II) Complexes of with a Non-Schiff-Base Tetradentate Ligand: an Example of Slow Motion Ferromagnetic Phase Transition at Very Low Temperature


Hexanuclear and heptanuclear nickel(II) complexes with N,N′-bis(2-hydroxy-3,5-dimethylbenzyl-1,2-ethanediamine (H2hdde), [Ni6(hdde)3(OH)4(NO3)2(H2O)2]·2dmf (dmf = N,N-dimethylformamide) and [Ni7(hdde)3(OH)6(dmac)3](ClO4)2 (dmac = N,N-dimethylacetamide), were investigated. The latter complex was newly synthesized and the single-crystal X-ray structure analysis revealed a wheel-shaped heptanuclear cluster. These complexes showed a ferromagnetic interaction in the temperature dependence of magnetic susceptibilities. The micro-SQUID data of the former complex did not show SMM property, whereas the AC susceptibility measurements suggested SMM-like behavior and the zero-field-cooled and field-cooled studies showed a ferromagnetic transition near 240 mK for the latter complex.

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The present work was partially supported by Grant-in-Aid for Scientific Research No. 17 K05820 from the Ministry of Education, Culture, Sports, Science and Technology (MEXT, Japan) and the MEXT-Supported Program for the Strategic Research Foundation at Private Universities, 2010—2014.

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Mikuriya, M., Yano, S., Yoshioka, D. et al. Hexanuclear and Heptanuclear Nickel(II) Complexes of with a Non-Schiff-Base Tetradentate Ligand: an Example of Slow Motion Ferromagnetic Phase Transition at Very Low Temperature. J Supercond Nov Magn 32, 2805–2810 (2019). https://doi.org/10.1007/s10948-019-5027-2

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  • Oligonuclear metal complex
  • Magnetic property
  • Ferromagnetic interaction
  • Tetradentate ligand
  • Ni(II) complex