(C sub(4)H sub(12)N sub(2))[CoCl sub(4)]: tetrahedrally coordinated Co super(2+) without the orbital degeneracy

We report on the synthesis, crystal structure and magnetic properties of a previously unreported Co super(2+) compound, (C sub(4)H sub(12)N sub(2)) [CoCl sub(4)], based upon a tetrahedral crystalline environment. The magnetic ground state of Co super(2+), measured with magnetization, implies an abse...

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Bibliographic Details
Published in:Acta crystallographica Section B, Structural science, crystal engineering and materials Structural science, crystal engineering and materials, 2015-02, Vol.71 (1), p.20-24
Main Authors: Decaroli, C, Arevalo-Lopez, A M, Woodall, CH, Rodriguez, EE, Attfield, J P, Parker, S F, Stock, C
Format: Article
Language:English
Subjects:
Crystal structure
Ground state
Magnetic permeability
Magnetic susceptibility
Magnetization
Orbitals
Order disorder
Spin-orbit interactions
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Summary:We report on the synthesis, crystal structure and magnetic properties of a previously unreported Co super(2+) compound, (C sub(4)H sub(12)N sub(2)) [CoCl sub(4)], based upon a tetrahedral crystalline environment. The magnetic ground state of Co super(2+), measured with magnetization, implies an absence of spin-orbit coupling and orbital degeneracy. This contrasts with compounds based upon an octahedral and even known tetrahedral Co super(2+) [Cotton et al. (1961). J. Am. Chem. Soc.83, 4690] systems where a sizable spin-orbit coupling is measured. The compound is characterized with single-crystal X-ray diffraction, magnetic susceptibility, IR and UV-vis spectroscopy. Magnetic susceptibility measurements find no magnetic ordering above 2K. The results are also compared with the previously known monoclinic hydrated analogue.
ISSN:2052-5206
2052-5206
DOI:10.1107/S2052520614024809