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Crystal structures and magnetic properties of nitronyl nitroxide NIT2-phtrz and its M(II) hexafluoroacetylacetonate (M = manganese, copper) complexes [M(hfac)2(NIT2-phtrz)]

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Abstract

M(hfac)2 (M = Mn, Cu. hfac = hexafluoroacetylacetonate) reacts with the nitronyl nitroxide radical 4,4,5,5-tetramethyl-2-(2-phenyl-1,2,3-triazole-4-yl)imidazoline-1–oxyl-3-oxide, NIT2-phtrz (L), yielding two novel complexes [Mn(hfac)2(L)] and [Cu(hfac)2(L)]. They have been structurally and magnetically characterized. Ligand L exists in a 1-D zigzag chain structure by intermolecular H-bond interactions. [Mn(hfac)2(L)] and [Cu(hfac)2(L)] have similar structures. Each M(II) atom is coordinated by one O atom and one N atom from one L ligand and four O atoms from two hfac ligands to complete a distorted octahedral coordination environment. L acts as a bidentate ligand through the triazole N1 and one oxygen atom of the nitroxide group. Ligand L exhibits weak intermolecular antiferromagnetic interactions. [Mn(hfac)2(L)] and [Cu(hfac)2(L)] exhibit strong intramolecular antiferromagnetic interactions between the M atom and L; intermolecular antiferromagnetic interactions are observed. The magnetic properties of these compounds are discussed in connection with their crystal structures.

Graphical abstract

Nitronyl nitroxide ligand NIT2-phtrz and its two novel M(hfac)2 compounds have been synthesized and characterized by X-ray crystallography. The magnetic properties of three compounds are discussed in connection with their crystal structures.

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Acknowledgments

The work was supported by the National Natural Science Foundation of China (No. 21071006), the Natural Science Foundation of Henan Province (No. 102102210457 and 112102210371), and the Natural Science Foundation of the Henan Higher Education Institutions of China (No. 2010B150001).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455002, China

    You-Juan Zhang, Jun-Jie Wang & Jing Chen

  2. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450052, China

    Qiang Huang & Jing Chen

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  1. You-Juan Zhang
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  2. Jun-Jie Wang
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Correspondence to Jing Chen.

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Zhang, YJ., Wang, JJ., Huang, Q. et al. Crystal structures and magnetic properties of nitronyl nitroxide NIT2-phtrz and its M(II) hexafluoroacetylacetonate (M = manganese, copper) complexes [M(hfac)2(NIT2-phtrz)]. Transition Met Chem 37, 743–749 (2012). https://doi.org/10.1007/s11243-012-9646-8

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