Intramolekularer Antiferromagnetismus in [Cr2(μ-NH2)3(NH3)6]I3 |
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| Authors: | Heiko Lueken Helmut Schilder Herbert Jacobs Uwe Zachwieja |
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| Abstract: | Intramolecular Antiferromagnetism in Cr2(μ-NH2)3(NH3)6]I3 The magnetism of Cr2(μ-NH2)3(NH3)6]I3 which consists of binuclear cations with NH2?-bridged face-sharing octahedral coordination polyhedra and a metal-metal separation of 264.9 pm can be explained by antiferromagnetically exchange-coupled CrIII-3d3 pairs. The magnetochemical analysis in the temperature range 5 K – 295 K on the basis of the isotropic Heisenberg model (spin Hamiltonian ? = ?2 J?1 · ?2) leads to the parameter value J = ?98(3) cm?1. Compared to the exchange coupling in corresponding binuclear chromium compounds with OH? bridges and identical metal-metal separation the strength of the coupling is significantly enhanced (JNH2/JOH ≈? 1.6). |
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| Keywords: | Tri-μ -amido-bis-[triammine chromium(III)]-iodide binuclear chromium compound antiferromagnetic exchange coupling |
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