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Issue 27, 2018
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High-coordinate CoII and FeII compounds constructed from an asymmetric tetradentate ligand show slow magnetic relaxation behavior

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Abstract

Using an asymmetric tetradentate ligand N-((6-(1H-pyrazol-1-yl)pyridin-2-yl)methylene)benzohydrazide (pypzbeyz), two high-coordinate 3d transition metal compounds [CoII(pypzbeyz)(NO3)2] (1) and [FeII(pypzbeyz)2](BF4)2(CH3CN) (2) have been synthesized and characterized by structural and magnetic measurements. X-ray crystallographic analyses revealed that compound 1 is seven-coordinate with a distorted pentagonal bipyramidal geometry (pseudo-D5h) and compound 2 is eight-coordinate with a triangular dodecahedral geometry (pseudo-D2d). Direct current (dc) magnetic susceptibilities revealed that compound 1 shows easy-plane magnetic anisotropy (D = +29.9 cm−1, E = 0.31 cm−1) and 2 shows easy-axis magnetic anisotropy (D = −6.6 cm−1, E = 0.02 cm−1). Alternating current (ac) magnetic measurements indicate that both compounds exhibit field-induced slow magnetic relaxation behavior. Furthermore, ab initio calculations also demonstrate that compound 1 presents a strong easy-plane magnetic anisotropy and 2 presents an easy-axis magnetic anisotropy, which are further identified by the calculated orientations of the local magnetic axes. These results demonstrate an effective way to achieve the targeted synthesis of high-coordinate 3d SIMs.

Graphical abstract: High-coordinate CoII and FeII compounds constructed from an asymmetric tetradentate ligand show slow magnetic relaxation behavior

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Publication details

The article was received on 07 May 2018, accepted on 07 Jun 2018 and first published on 07 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01829D
Citation: Dalton Trans., 2018,47, 8940-8948
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    High-coordinate CoII and FeII compounds constructed from an asymmetric tetradentate ligand show slow magnetic relaxation behavior

    X. Huang, Z. Qi, C. Ji, Y. Guo, S. Yan, Y. Zhang, D. Shao and X. Wang, Dalton Trans., 2018, 47, 8940
    DOI: 10.1039/C8DT01829D

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