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A new series of tetrahedral Co(II) complexes [CoLX2] (X = NCS, Cl, Br, I) manifesting single-ion magnet features

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Abstract

A series of tetrahedral CoII complexes [CoLX2] (X = NCS (1), Cl (2), Br (3) and I (4); L = 9,9-dimethyl-4,5-bis(diphenylphosphino) xanthene) based on a P-donor ligand has been prepared to investigate the influence of terminal ligand field strength on the anisotropy of CoII single-ion magnets. It has been observed that heavier and softer terminal ligands are able to decrease the anisotropy of the tetrahedral CoII centers. Thorough analyses of experimental and theoretical studies show that all complexes have an easy-axis type magnetic anisotropy and slow relaxation behaviors of tetrahedral CoII centers. Detailed ab initio theory studies disclose that the changes in the ligand field strength imposed by the terminal ligands result in modifying the single ion anisotropy (D) of polyhedra 1–4. Furthermore, the isostructural ZnII analogue (5) has been prepared to examine the influence of dipolar interactions between adjacent CoII centres and magnetic dilution experiments were performed.

Graphical abstract: A new series of tetrahedral Co(ii) complexes [CoLX2] (X = NCS, Cl, Br, I) manifesting single-ion magnet features

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Publication details

The article was received on 25 Oct 2017, accepted on 30 Jan 2018 and first published on 30 Jan 2018


Article type: Paper
DOI: 10.1039/C7DT04007E
Citation: Dalton Trans., 2018, Advance Article
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    A new series of tetrahedral Co(II) complexes [CoLX2] (X = NCS, Cl, Br, I) manifesting single-ion magnet features

    A. K. Mondal, M. Sundararajan and S. Konar, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C7DT04007E

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