Synthesis, crystal structures and magnetic properties of nitronyl nitroxide radical-coordinated copper(II) complexes

  • Yan-Li GaoEmail author
  • Katsuya InoueEmail author


The coordination compound constructed for nitronyl nitroxide radical NIT-Ph-4-Br and CuII(hfac)2(H2O)2 building blocks (NIT-Ph-4-Br = 2-(4-bromo-phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, hfac = hexafluoroacetylacetonato) was successfully synthesized. The single-crystal X-ray diffraction analyses indicated that the complexes {(NIT-Ph-4-Br)2[Cu(hfac)2]3} have centrosymmetric five-spin structures consisting of three Cu(II) ions bridged by two nitroxide ligands and that they consist of two types of copper atoms, one with a heavily Jahn–Teller distorted (4 + 2) octahedral coordination (Cuoct) and hfac in trans-positions and the other with square pyramidal five-coordinated (Cupyr) with three hfac oxygen atoms and N–O oxygen atom at the base and the one hfac oxygen atom at the apex. Different geometries of the copper ions are quite important for magnetochemistry. The magnetic susceptibility study of the coordination compound shows strong antiferromagnetic interactions between the metal center and the organic radical.



This work was supported by (a) a Grant-in-Aid for Scientific Research (S) (No. 25220803) “Toward a New Class Magnetism by Chemically-controlled Chirality,” (b) a National Nature Science Foundation of China (No. 51762042), (c) Shaanxi Provincial Science and Technology Department Innovative Talent Promotion Plan Project of China (No. 2018KJXX-078) and (d) Doctoral Scientific Research Foundation of Yulin university (18GK24).


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.School of Chemistry and Chemical EngineeringYulin UniversityYulinChina
  2. 2.Department of ChemistryHiroshima UniversityHiroshimaJapan
  3. 3.Center for Chiral Science, Hiroshima UniversityHiroshimaJapan

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