A pentagonal bipyramidal Co(II) single-ion magnet based on an asymmetric tetradentate ligand with easy plane anisotropy

Singh, Saurabh Kumar (2023) A pentagonal bipyramidal Co(II) single-ion magnet based on an asymmetric tetradentate ligand with easy plane anisotropy. Polyhedron, 232. p. 116275. ISSN 0277-5387

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Abstract

High-coordinate 3d single-ion magnets(SIMs) especially with pentagonal bipyramidal geometry as an emerging class of representative molecular magnets have received considerable concern. Whereas, it is not easy to construct and obtain 3d SIMs with high coordination numbers (CN = 7 or 8). Herein, a mononuclear Co(II) complex ([Co(pypzbeyz)(NCS)2(DMF)], pypzbeyz = N-((6-(1H-pyrazol-1-yl)pyridin-2-yl)methylene)benzohydrazide) based on a tetradentate ligand has been synthesized and structurally and magnetically characterized. Single-crystal X-ray diffraction analysis reveals that the Co(II) complex adopts a seven-coordinate distorted pentagonal bipyramidal geometry. Magnetic investigations show that the Co(II) complex has large easy plane anisotropy with a positive D value (D = +36.8 cm−1) and a small E value, and exhibits slow magnetic relaxation behavior under a dc field. Theoretical calculations show a positive zero-field splitting of 33.5 cm−1, which is in excellent agreement with the experiment. The results support that the 3d high-coordinate SIMs could be effectively achieved by using a suitable multi-dentate ligand with a certain ligand field.

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IITH Creators:

IITH Creators	ORCiD
Singh, Saurabh Kumar	http://www.orcid.org/0000-0001-9488-8036

Item Type:

Article

Uncontrolled Keywords:

Co(II); Easy plane anisotropy; Pentagonal bipyramid; Single-ion magnet; Theoretical calculations; Anisotropy; Cobalt compounds; Ligands; Single crystals; X ray powder diffraction; Ions; Bipyramids; Co(II); Easy-plane anisotropy; Molecular magnet; Pentagonal bipyramid; Pentagonal bipyramidal geometry; Single ion; Single-ion magnet; Tetradentate ligands; Theoretical calculations

Subjects:

Chemistry
Chemistry > Physical chemistry
Chemistry > Inorganic chemistry

Divisions:

Department of Chemistry

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

26 Aug 2023 11:55

Last Modified:

26 Aug 2023 11:55

URI:

http://raiithold.iith.ac.in/id/eprint/11628