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Synthesis, crystal structure and magnetism of two cobalt(II) complexes with imino and nitronyl nitroxides

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Abstract

Two new cobalt–radical complexes, namely [Co(IM-5-Br-2Py)2(N3)2]·MeOH (1) and [Co(NIT-5-Br-2Py)2(N3)2] (2) (IM-5-Br-2Py = 2-(5-bromo-2-pyridyl)-4,4,5,5-tetramethyl-limidazoline-1-oxyl, NIT-5-Br-2Py = 2-(5-bromo-2-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been synthesized and characterized by magnetic and single-crystal X-ray diffraction studies. X-ray diffraction analysis indicates that both complexes possess mononuclear structures, in which two radical ligands coordinate to the Co(II) atom in chelating fashion and two azides act as terminal ligands. The magnetic properties for complexes 1 and 2 have been investigated in the temperature range 2–300 K. DC magnetic measurements show that the Co(II) atom of complex 1 interacts ferromagnetically with the directly bonding imino nitroxide, while the Co(II) atom strongly antiferromagnetically couples with the directly coordinated N–O group in complex 2.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 21471083) and MOE Innovation Team (IRT13022) of China.

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Authors and Affiliations

  1. Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin, 300071, China

    Cun Li, Junqing Zhang & Licun Li

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  1. Cun Li
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  2. Junqing Zhang
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  3. Licun Li
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Corresponding author

Correspondence to Licun Li.

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Li, C., Zhang, J. & Li, L. Synthesis, crystal structure and magnetism of two cobalt(II) complexes with imino and nitronyl nitroxides. Transition Met Chem 40, 631–636 (2015). https://doi.org/10.1007/s11243-015-9956-8

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  • DOI: https://doi.org/10.1007/s11243-015-9956-8

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