A Novel Molecular Assembly of a Cobalt–Sulfate Coordination Polymer and Melamine: A Manifestation of Magnetic Anisotropy

A novel molecular assembly of a cobalt–sulfate coordination polymer and melamine is synthesized under acidic conditions. Bar-shaped pink monocrystals as long as 1 mm are found to align along magnetic field lines in the proximity of a strong magnet. Magnetometry shows no hysteresis at temperatures do...

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Bibliographic Details
Published in:ACS omega 2023-01, Vol.8 (3), p.3493-3500
Main Authors: Vírseda, Ignacio Bernabé, Siddiqui, Shiraz Ahmed, Prado-Roller, Alexander, Eisterer, Michael, Shiozawa, Hidetsugu
Format: Article
Language:English
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Summary:A novel molecular assembly of a cobalt–sulfate coordination polymer and melamine is synthesized under acidic conditions. Bar-shaped pink monocrystals as long as 1 mm are found to align along magnetic field lines in the proximity of a strong magnet. Magnetometry shows no hysteresis at temperatures down to 2 K but instead magnetic anisotropy and antiferromagnetic coupling. X-ray diffraction on a single crystal reveals that the cobalt–sulfate chains are along the shortest lattice vector or the crystal’s long axis. The crystal alignment along the magnetic flux can be attributed to single-ion anisotropy that results in longitudinal antiferromagnetic coupling along the chain. Both structurally and magnetically isotropic crystals of metal–organic hybrid materials can be highly useful as elemental components in magneto-optics.
ISSN:2470-1343
2470-1343
DOI:10.1021/acsomega.2c07556