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Zeitschrift für Naturforschung B Contents Vol. 67b (2012)

Z. Naturforsch. 2012, 67b, 1205 – 1211

doi:10.5560/ZNB.2012-0234

Syntheses, Crystal Structures and Magnetic Properties of Cr(NCNH₂)₄Cl₂ and Mn(NCNH₂)₄Cl₂

Xiaojuan Tang¹, Manfred Speldrich¹, Andrei L. Tchougréeff^1,2, and Richard Dronskowski¹

¹Institute of Inorganic Chemistry, RTWH Aachen University, Landoltweg 1, 52056 Aachen, Germany

²Poncelet Laboratory, Independent University of Moscow, and Department of Chemistry, Moscow State (Lomonosov) University, Moscow, Russia

Reprint requests to Prof. Dr. Richard Dronskowski. Fax: +49-241-80-92642. E-mail: drons@HAL9000.ac.rwth-aachen.de

Received September 6, 2012 / published online November 12, 2012

The two isotypic compounds Cr(NCNH₂)₄Cl₂ and Mn(NCNH₂)₄Cl₂ have been synthesized and characterized by X-ray diffraction. They crystallize in the cubic space group Im3̅m (Z = 6) with a =12.643(2) Å for Cr(NCNH₂)₄Cl₂ and a =12.821(1) Å for Mn(NCNH₂)₄Cl₂. The divalent transition metal ions are octahedrally coordinated by four H₂NCN molecules in equatorial and two chloride ions in axial positions. The magnetic susceptibility data of the four Curie-paramagnetic compounds Cr(NCNH₂)₄Cl₂, Mn(NCNH₂)₄Cl₂, Co(NCNH₂)₄Cl₂, and Ni(NCNH₂)₄Cl₂ have been analyzed in greater detail, including many-body quantum theory.

Key words: Chromium, Manganese, Cyanamide, Chloride, Crystal Structure, Magnetism

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