(C4H12N2)[CoCl4]: tetrahedrally coordinated Co2+ without the orbital degeneracy. Issue 1 (1st February 2015)

• Record Type: Journal Article
• Authors: Decaroli, C.; Arevalo‐Lopez, A. M.; Woodall, C. H.; Rodriguez, E. E.; Attfield, J. P.; Parker, S. F.; Stock, C.
• Is Part Of: Acta crystallographica. Volume 71:Issue 1(2015:Feb.)
• Page Start: 20
• Page End: 24
• Publication Date: 2015-02-01
• DOI: 10.1107/S2052520614024809
• Languages: English
• ISSNs: 2052-5206

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>We report on the synthesis, crystal structure and magnetic properties of a previously unreported Co²⁺<inline-graphic xlink:href="ark:/27927/pgh3r5gww90" mimetype="image" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /> compound, (C₄H₁₂N₂)[CoCl₄], based upon a tetrahedral crystalline environment. The <inline-graphic xlink:href="ark:/27927/pgh3r5gww90" mimetype="image" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /> magnetic ground state of Co²⁺, 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 Co²⁺ [Cotton <italic>et al.</italic> (1961). <italic>J. Am. Chem. Soc.</italic><bold>83</bold>, 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 2 K. The results are also compared with the previously known monoclinic hydrated analogue.</p> </abstract>