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Loop chain and three-dimensional network assembled by multi-dentate nitronyl nitroxide radical and M(hfac)2 (M = CoII, CuII)

Abstract

Multi-dentate nitronyl nitroxide radical Nit-Ph-3,5-bIm (Nit-Ph-3,5-bIm=2-[3,5-bis(1-imidazole)-phenyl]-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) reacted with Co(hfac)2·2H2O or Cu(hfac)2 to yield two novel 3d-radical complexes {[Co(hfac)2]2(Nit-Ph-3,5-bIm)}n1 and {[Cu(hfac)2]7(Nit-Ph-3,5-bIm)3}n2 (hfac- = hexafluoroacetylacetonate). In both compounds, the Nit-Ph-3,5-bIm radical ligand behaves as a tetradentate ligand to link four M(hfac)2 units in μ41111-coordination mode via its two NO groups and two N atoms of imidazole, generating unique loop chain for 1 and three-dimensional framework for 2. The magnetic studies revealed a strong antiferromagnetic Co-ON exchange interaction in 1 while a ferromagnetic Cu-ON interaction is observed in 2. The dc magnetic behaviors of two complexes are analyzed by means of appropriate magnetic models. Furthermore, ac magnetic susceptibilities of complex Co reveal slow relaxation of the magnetization.

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Publication details

The article was received on 07 Aug 2018, accepted on 12 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8DT03222J
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Loop chain and three-dimensional network assembled by multi-dentate nitronyl nitroxide radical and M(hfac)2 (M = CoII, CuII)

    J. Sun, L. Xi, J. Xie, K. Wang, L. Li and J. Sutter, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT03222J

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