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Field Induced Single Ion Magnetic Behaviour in Square-Pyramidal Cobalt(II) Complexes with Easy-Plane Magnetic Anisotropy

Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
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Present address: Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Magnetochemistry 2019, 5(1), 12; https://doi.org/10.3390/magnetochemistry5010012
Received: 23 October 2018 / Revised: 22 January 2019 / Accepted: 24 January 2019 / Published: 2 February 2019
(This article belongs to the Special Issue A Themed Issue in Honor of Late Professor Samiran Mitra)
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Abstract

Two penta-coordinate CoII complexes with formulae [Co(14-TMC)Cl](BF4) (1, 14-TMC = 1,4,8,11-Tetramethyl-1,4,8,11-tetraazacyclotetradecane) and [Co(12-TBC)Cl](ClO4)·(MeCN) (2, 12-TBC = 1,4,7,10-Tetrabenzyl-1,4,7,10-tetraazacyclododecane) were synthesized and characterized. Structural analysis revealed that ligand coordinates to the CoII centre in a tetradentate fashion and the fifth position is occupied by chloride ion and the geometries around CoII centres are best described as distorted square pyramidal. Detailed magnetic measurements disclose the presence of significant easy-plane magnetic anisotropy and field induced slow magnetic relaxation behaviours of the studied complexes. More insight into the magnetic anisotropy has been given using ab initio theory calculations, which agree well with the experimental values and further confirmed the easy-plane magnetic anisotropy. View Full-Text
Keywords: Cobalt(II); square-pyramidal; single ion anisotropy; slow magnetic relaxation Cobalt(II); square-pyramidal; single ion anisotropy; slow magnetic relaxation
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Mondal, A.K.; Mondal, A.; Konar, S. Field Induced Single Ion Magnetic Behaviour in Square-Pyramidal Cobalt(II) Complexes with Easy-Plane Magnetic Anisotropy. Magnetochemistry 2019, 5, 12.

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