title: (C4H12N2)[CoCl4]: tetrahedrally coordinated Co2+ without the orbital degeneracy.
abstract: We report on the synthesis, crystal structure and magnetic properties of a previously unreported Co(2+) S = 3/2 compound, (C4H12N2)[CoCl4], based upon a tetrahedral crystalline environment. The S = 3/2 magnetic ground state of Co(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(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 2 K. The results are also compared with the previously known monoclinic hydrated analogue.
authors: School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, Scotland.
authors: C
authors: C
authors: Decaroli
authors: School of Chemistry, University of Edinburgh, Edinburgh EH9 3JZ, Scotland.
authors: A M
authors: AM
authors: Arevalo-Lopez
authors: School of Chemistry, University of Edinburgh, Edinburgh EH9 3JZ, Scotland.
authors: C H
authors: CH
authors: Woodall
authors: Department of Chemistry of Biochemistry, University of Maryland, College Park, MD 20742, USA.
authors: E E
authors: EE
authors: Rodriguez
authors: School of Chemistry, University of Edinburgh, Edinburgh EH9 3JZ, Scotland.
authors: J P
authors: JP
authors: Attfield
authors: ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, England.
authors: S F
authors: SF
authors: Parker
authors: School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, Scotland.
authors: C
authors: C
authors: Stock
keywords: magnetic properties; orbital degeneracy